diff --git a/cmake/modules/BuildPlugin.cmake b/cmake/modules/BuildPlugin.cmake
index 1722e3dce..a527b8472 100644
--- a/cmake/modules/BuildPlugin.cmake
+++ b/cmake/modules/BuildPlugin.cmake
@@ -9,7 +9,7 @@ MACRO(BUILD_PLUGIN PLUGIN_NAME)
 	CMAKE_PARSE_ARGUMENTS(PLUGIN "" "" "MOCFILES;EMBEDDED_RESOURCES;UICFILES;LINK" ${ARGN})
 	SET(PLUGIN_SOURCES ${PLUGIN_UNPARSED_ARGUMENTS})
 
-	INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/include)
+	INCLUDE_DIRECTORIES("${CMAKE_CURRENT_BINARY_DIR}" "${CMAKE_BINARY_DIR}" "${CMAKE_SOURCE_DIR}/include")
 
 	ADD_DEFINITIONS(-DPLUGIN_NAME=${PLUGIN_NAME})
 
@@ -22,7 +22,7 @@ MACRO(BUILD_PLUGIN PLUGIN_NAME)
 			FILE(GLOB EXPANDED "${ARG}")
 			LIST(SORT EXPANDED)
 			FOREACH(ITEM ${EXPANDED})
-				LIST(APPEND NEW_ARGS ${ITEM})
+				LIST(APPEND NEW_ARGS "${ITEM}")
 			ENDFOREACH()
 		ENDFOREACH()
 		SET(PLUGIN_EMBEDDED_RESOURCES ${NEW_ARGS})
@@ -38,11 +38,11 @@ MACRO(BUILD_PLUGIN PLUGIN_NAME)
 	ENDFOREACH(f)
 
 	IF(LMMS_BUILD_APPLE)
-		LINK_DIRECTORIES(${CMAKE_BINARY_DIR})
+		LINK_DIRECTORIES("${CMAKE_BINARY_DIR}")
 		LINK_LIBRARIES(${QT_LIBRARIES})
 	ENDIF(LMMS_BUILD_APPLE)
 	IF(LMMS_BUILD_WIN32)
-		LINK_DIRECTORIES(${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR})
+		LINK_DIRECTORIES("${CMAKE_BINARY_DIR}" "${CMAKE_SOURCE_DIR}")
 		LINK_LIBRARIES(${QT_LIBRARIES})
 	ENDIF(LMMS_BUILD_WIN32)
 	IF(LMMS_BUILD_MSYS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
@@ -65,12 +65,12 @@ MACRO(BUILD_PLUGIN PLUGIN_NAME)
 	INSTALL(TARGETS ${PLUGIN_NAME} LIBRARY DESTINATION "${PLUGIN_DIR}")
 
 	IF(LMMS_BUILD_APPLE)
-		SET_TARGET_PROPERTIES(${PLUGIN_NAME} PROPERTIES LINK_FLAGS "-bundle_loader ${CMAKE_BINARY_DIR}/lmms")
+		SET_TARGET_PROPERTIES(${PLUGIN_NAME} PROPERTIES LINK_FLAGS "-bundle_loader \"${CMAKE_BINARY_DIR}/lmms\"")
 		ADD_DEPENDENCIES(${PLUGIN_NAME} lmms)
 	ENDIF(LMMS_BUILD_APPLE)
 	IF(LMMS_BUILD_WIN32 AND STRIP)
 		SET_TARGET_PROPERTIES(${PLUGIN_NAME} PROPERTIES PREFIX "")
-		ADD_CUSTOM_COMMAND(TARGET ${PLUGIN_NAME} POST_BUILD COMMAND ${STRIP} $<TARGET_FILE:${PLUGIN_NAME}>)
+		ADD_CUSTOM_COMMAND(TARGET ${PLUGIN_NAME} POST_BUILD COMMAND ${STRIP} "$<TARGET_FILE:${PLUGIN_NAME}>")
 	ENDIF()
 
 	SET_DIRECTORY_PROPERTIES(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${RCC_OUT} ${plugin_MOC_out}")
diff --git a/cmake/modules/FindSndio.cmake b/cmake/modules/FindSndio.cmake
index bf5b24c39..3fcd71360 100644
--- a/cmake/modules/FindSndio.cmake
+++ b/cmake/modules/FindSndio.cmake
@@ -19,14 +19,16 @@ if(SNDIO_LIBRARY)
    get_filename_component(SNDIO_LIBRARY_DIR ${SNDIO_LIBRARY} PATH)
 endif(SNDIO_LIBRARY)
 
-check_library_exists(sndio sio_open "${SNDIO_LIBRARY_DIR}" HAVE_SNDIO)
-if(HAVE_SNDIO)
-    message(STATUS "Found sndio: ${SNDIO_LIBRARY}")
-else(HAVE_SNDIO)
-    message(STATUS "sndio not found")
+check_library_exists(sndio sio_open "${SNDIO_LIBRARY_DIR}" HAVE_SIO_OPEN)
+
+find_path(SNDIO_INCLUDE_DIR sndio.h)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SNDIO DEFAULT_MSG SNDIO_LIBRARY SNDIO_INCLUDE_DIR HAVE_SIO_OPEN)
+
+if(SNDIO_FOUND)
+    set(SNDIO_INCLUDE_DIRS "${SNDIO_INCLUDE_DIR}")
+    set(SNDIO_LIBRARIES "${SNDIO_LIBRARY}")
 endif(HAVE_SNDIO)
-set(SNDIO_FOUND ${HAVE_SNDIO})
 
-find_path(SNDIO_INCLUDES sndio.h)
-
-mark_as_advanced(SNDIO_INCLUDES SNDIO_LIBRARY)
+mark_as_advanced(SNDIO_INCLUDE_DIR SNDIO_LIBRARY SNDIO_INCLUDE_DIRS SNDIO_LIBRARIES)
diff --git a/data/locale/sv.ts b/data/locale/sv.ts
index 3b75e54c0..6f0120deb 100644
--- a/data/locale/sv.ts
+++ b/data/locale/sv.ts
@@ -3939,7 +3939,7 @@ Besök https://lmms.io/documentation/ för dokumentation (Engelska).</translatio
     </message>
     <message>
         <source>&amp;View</source>
-        <translation>%Visa</translation>
+        <translation>&amp;Visa</translation>
     </message>
     <message>
         <source>Toggle metronome</source>
@@ -9950,4 +9950,4 @@ The LED in the lower right corner of the waveform editor determines whether the
         <translation>Utgångsförstärkning</translation>
     </message>
 </context>
-</TS>
\ No newline at end of file
+</TS>
diff --git a/include/AudioFileDevice.h b/include/AudioFileDevice.h
index 7b6b81eab..e7177b30f 100644
--- a/include/AudioFileDevice.h
+++ b/include/AudioFileDevice.h
@@ -56,6 +56,10 @@ protected:
 		return m_outputFile.isOpen();
 	}
 
+	inline int outputFileHandle() const
+	{
+		return m_outputFile.handle();
+	}
 
 private:
 	QFile m_outputFile;
diff --git a/include/DrumSynth.h b/include/DrumSynth.h
index 22d7d3071..f7e9b1d4c 100644
--- a/include/DrumSynth.h
+++ b/include/DrumSynth.h
@@ -30,22 +30,24 @@
 #include <stdint.h>
 #include "lmms_basics.h"
 
+class QString;
+
 class DrumSynth {
     public:
         DrumSynth() {};
-        int GetDSFileSamples(const char *dsfile, int16_t *&wave, int channels, sample_rate_t Fs);
+        int GetDSFileSamples(QString dsfile, int16_t *&wave, int channels, sample_rate_t Fs);
 
     private:
         float LoudestEnv(void);
         int   LongestEnv(void);
         void  UpdateEnv(int e, long t);
-        void  GetEnv(int env, const char *sec, const char *key, const char *ini);
+        void  GetEnv(int env, const char *sec, const char *key, QString ini);
 
         float waveform(float ph, int form);
 
-        int GetPrivateProfileString(const char *sec, const char *key, const char *def, char *buffer, int size, const char *file);
-        int GetPrivateProfileInt(const char *sec, const char *key, int def, const char *file);
-        float GetPrivateProfileFloat(const char *sec, const char *key, float def, const char *file);
+        int GetPrivateProfileString(const char *sec, const char *key, const char *def, char *buffer, int size, QString file);
+        int GetPrivateProfileInt(const char *sec, const char *key, int def, QString file);
+        float GetPrivateProfileFloat(const char *sec, const char *key, float def, QString file);
 
 };
 
diff --git a/include/ImportFilter.h b/include/ImportFilter.h
index 304de5fa4..1b6fe2b59 100644
--- a/include/ImportFilter.h
+++ b/include/ImportFilter.h
@@ -78,6 +78,11 @@ protected:
 		return m_file.read( _data, _len );
 	}
 
+	inline QByteArray readAllData()
+	{
+		return m_file.readAll();
+	}
+
 	inline void ungetChar( char _ch )
 	{
 		m_file.ungetChar( _ch );
diff --git a/include/IoHelper.h b/include/IoHelper.h
new file mode 100644
index 000000000..687e000d1
--- /dev/null
+++ b/include/IoHelper.h
@@ -0,0 +1,72 @@
+/*
+ * IoHelper.h - helper functions for file I/O
+ *
+ * Copyright (c) 2018 Hyunjin Song <tteu.ingog/at/gmail.com>
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+#include "lmmsconfig.h"
+
+#include <cstdio>
+
+
+#ifdef _WIN32
+#include <windows.h>
+
+std::wstring toWString(const std::string& s)
+{
+	std::wstring ret;
+	int len = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, s.data(),
+			s.length(), nullptr, 0);
+	if (len == 0)
+	{
+		return ret;
+	}
+	ret.resize(len);
+	MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, s.data(), s.length(), &ret[0], len);
+	return ret;
+}
+#endif
+
+#ifdef LMMS_BUILD_WIN32
+#include <io.h>
+#define F_OPEN_UTF8(a, b) _wfopen(toWString(a).data(), L##b)
+#else
+#ifdef LMMS_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#define F_OPEN_UTF8(a, b) fopen((a).data(), b)
+#endif
+
+int fileToDescriptor(FILE* f, bool closeFile = true)
+{
+	int fh;
+	if (f == NULL) {return -1;}
+
+#ifdef LMMS_BUILD_WIN32
+	fh = _dup(_fileno(f));
+#else
+	fh = dup(fileno(f));
+#endif
+
+	if (closeFile) {fclose(f);}
+	return fh;
+}
diff --git a/include/MainApplication.h b/include/MainApplication.h
index d3acb95ca..4edf55d5e 100644
--- a/include/MainApplication.h
+++ b/include/MainApplication.h
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017-2017 Tres Finocchiaro <tres.finocchiaro/at/gmail.com>
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/include/SampleBuffer.h b/include/SampleBuffer.h
index 01c685fda..974da669f 100644
--- a/include/SampleBuffer.h
+++ b/include/SampleBuffer.h
@@ -270,15 +270,15 @@ private:
 	void convertIntToFloat ( int_sample_t * & _ibuf, f_cnt_t _frames, int _channels);
 	void directFloatWrite ( sample_t * & _fbuf, f_cnt_t _frames, int _channels);
 
-	f_cnt_t decodeSampleSF( const char * _f, sample_t * & _buf,
+	f_cnt_t decodeSampleSF( QString _f, sample_t * & _buf,
 						ch_cnt_t & _channels,
 						sample_rate_t & _sample_rate );
 #ifdef LMMS_HAVE_OGGVORBIS
-	f_cnt_t decodeSampleOGGVorbis( const char * _f, int_sample_t * & _buf,
+	f_cnt_t decodeSampleOGGVorbis( QString _f, int_sample_t * & _buf,
 						ch_cnt_t & _channels,
 						sample_rate_t & _sample_rate );
 #endif
-	f_cnt_t decodeSampleDS( const char * _f, int_sample_t * & _buf,
+	f_cnt_t decodeSampleDS( QString _f, int_sample_t * & _buf,
 						ch_cnt_t & _channels,
 						sample_rate_t & _sample_rate );
 
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index cb36db03f..392a2ad45 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -1,5 +1,5 @@
-SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 SET(CMAKE_DEBUG_POSTFIX "")
 
 # Enable C++11
diff --git a/plugins/LadspaEffect/swh/CMakeLists.txt b/plugins/LadspaEffect/swh/CMakeLists.txt
index fb8b03400..7703aaa6d 100644
--- a/plugins/LadspaEffect/swh/CMakeLists.txt
+++ b/plugins/LadspaEffect/swh/CMakeLists.txt
@@ -8,13 +8,6 @@ ELSE()
 	SET(PIC_FLAGS "-fPIC -DPIC")
 ENDIF()
 
-# Additional link flags
-IF(LMMS_BUILD_WIN32 AND MINGW_PREFIX)
-	SET(LINK_FLAGS "${LINK_FLAGS} -shared -Wl,-no-undefined -Wl,-Bsymbolic -lm")
-ELSEIF(LMMS_BUILD_APPLE)
-	SET(LINK_FLAGS "${LINK_FLAGS} -Bsymbolic -lm")
-ENDIF()
-
 # Additional compile flags
 SET(COMPILE_FLAGS "${COMPILE_FLAGS} -O3 -Wall")
 SET(COMPILE_FLAGS "${COMPILE_FLAGS} -fomit-frame-pointer -funroll-loops -ffast-math -c -fno-strict-aliasing")
@@ -44,6 +37,9 @@ FOREACH(_item ${XML_SOURCES})
 	IF(NOT ("${_plugin}" STREQUAL "vocoder_1337"))
 		TARGET_LINK_LIBRARIES("${_plugin}" -lfftw3f)
 	ENDIF()
+	IF(NOT MSVC)
+		TARGET_LINK_LIBRARIES("${_plugin}" m)
+	ENDIF()
 
 	SET_TARGET_PROPERTIES("${_plugin}" PROPERTIES PREFIX "")
 	SET_TARGET_PROPERTIES("${_plugin}" PROPERTIES COMPILE_FLAGS "${COMPILE_FLAGS}")
diff --git a/plugins/LadspaEffect/tap/CMakeLists.txt b/plugins/LadspaEffect/tap/CMakeLists.txt
index 0ae8ae54e..e0740bd5e 100644
--- a/plugins/LadspaEffect/tap/CMakeLists.txt
+++ b/plugins/LadspaEffect/tap/CMakeLists.txt
@@ -15,13 +15,8 @@ FOREACH(_item ${PLUGIN_SOURCES})
 	IF(LMMS_BUILD_WIN32 AND NOT CMAKE_BUILD_TYPE MATCHES "Deb")
 		ADD_CUSTOM_COMMAND(TARGET "${_plugin}" POST_BUILD COMMAND "${STRIP}" \"$<TARGET_FILE:${_plugin}>\")
 	ENDIF()
-	IF(LMMS_BUILD_APPLE)
-		SET_TARGET_PROPERTIES("${_plugin}" PROPERTIES LINK_FLAGS "${LINK_FLAGS} -Bsymbolic -lm")
-	ELSEIF(NOT LMMS_BUILD_OPENBSD)
-		SET_TARGET_PROPERTIES("${_plugin}" PROPERTIES LINK_FLAGS "${LINK_FLAGS} -shared -Wl,-no-undefined -Wl,-Bsymbolic -lm")
-	ENDIF()
-	IF(LMMS_BUILD_LINUX OR LMMS_BUILD_HAIKU)
-		SET_TARGET_PROPERTIES("${_plugin}" PROPERTIES LINK_FLAGS "${LINK_FLAGS}")
+	IF(NOT MSVC)
+		TARGET_LINK_LIBRARIES("${_plugin}" m)
 	ENDIF()
 ENDFOREACH()
 
diff --git a/plugins/MidiImport/MidiImport.cpp b/plugins/MidiImport/MidiImport.cpp
index 833994e5e..1200c6f78 100644
--- a/plugins/MidiImport/MidiImport.cpp
+++ b/plugins/MidiImport/MidiImport.cpp
@@ -26,9 +26,12 @@
 #include <QDomDocument>
 #include <QDir>
 #include <QApplication>
+#include <QFile>
 #include <QMessageBox>
 #include <QProgressDialog>
 
+#include <sstream>
+
 #include "MidiImport.h"
 #include "TrackContainer.h"
 #include "InstrumentTrack.h"
@@ -279,8 +282,6 @@ public:
 
 bool MidiImport::readSMF( TrackContainer* tc )
 {
-	QString filename = file().fileName();
-	closeFile();
 
 	const int preTrackSteps = 2;
 	QProgressDialog pd( TrackContainer::tr( "Importing MIDI-file..." ),
@@ -291,7 +292,11 @@ bool MidiImport::readSMF( TrackContainer* tc )
 
 	pd.setValue( 0 );
 
-	Alg_seq_ptr seq = new Alg_seq(filename.toLocal8Bit(), true);
+	std::stringstream stream;
+	QByteArray arr = readAllData();
+	stream.str(std::string(arr.constData(), arr.size()));
+
+	Alg_seq_ptr seq = new Alg_seq(stream, true);
 	seq->convert_to_beats();
 
 	pd.setMaximum( seq->tracks()  + preTrackSteps );
diff --git a/plugins/ReverbSC/ReverbSC.cpp b/plugins/ReverbSC/ReverbSC.cpp
index bfbd0390a..bae59471c 100644
--- a/plugins/ReverbSC/ReverbSC.cpp
+++ b/plugins/ReverbSC/ReverbSC.cpp
@@ -1,7 +1,7 @@
 /*
  * ReverbSC.cpp - A native reverb based on an algorithm by Sean Costello
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/ReverbSC/ReverbSC.h b/plugins/ReverbSC/ReverbSC.h
index ba987414b..0e697c197 100644
--- a/plugins/ReverbSC/ReverbSC.h
+++ b/plugins/ReverbSC/ReverbSC.h
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017 Paul Batchelor
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/ReverbSC/ReverbSCControlDialog.cpp b/plugins/ReverbSC/ReverbSCControlDialog.cpp
index 6b41415d9..9c9f3f44a 100644
--- a/plugins/ReverbSC/ReverbSCControlDialog.cpp
+++ b/plugins/ReverbSC/ReverbSCControlDialog.cpp
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017 Paul Batchelor
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/ReverbSC/ReverbSCControlDialog.h b/plugins/ReverbSC/ReverbSCControlDialog.h
index 9f262a88f..0d9c1f51a 100644
--- a/plugins/ReverbSC/ReverbSCControlDialog.h
+++ b/plugins/ReverbSC/ReverbSCControlDialog.h
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017 Paul Batchelor
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/ReverbSC/ReverbSCControls.cpp b/plugins/ReverbSC/ReverbSCControls.cpp
index ac6f8c689..0b9e337b4 100644
--- a/plugins/ReverbSC/ReverbSCControls.cpp
+++ b/plugins/ReverbSC/ReverbSCControls.cpp
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017 Paul Batchelor
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/ReverbSC/ReverbSCControls.h b/plugins/ReverbSC/ReverbSCControls.h
index 638bdade9..36cc16a7e 100644
--- a/plugins/ReverbSC/ReverbSCControls.h
+++ b/plugins/ReverbSC/ReverbSCControls.h
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017 Paul Batchelor
  * 
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/plugins/stk/mallets/mallets.cpp b/plugins/stk/mallets/mallets.cpp
index 621d1e5c7..964e1ddd2 100644
--- a/plugins/stk/mallets/mallets.cpp
+++ b/plugins/stk/mallets/mallets.cpp
@@ -620,7 +620,7 @@ malletsSynth::malletsSynth( const StkFloat _pitch,
 	{
 		Stk::setSampleRate( _sample_rate );
 		Stk::setRawwavePath( QDir( ConfigManager::inst()->stkDir() ).absolutePath()
-						.toLatin1().constData() );
+						.toLocal8Bit().constData() );
 #ifndef LMMS_DEBUG
 		Stk::showWarnings( false );
 #endif
@@ -670,7 +670,7 @@ malletsSynth::malletsSynth( const StkFloat _pitch,
 	{
 		Stk::setSampleRate( _sample_rate );
 		Stk::setRawwavePath( QDir( ConfigManager::inst()->stkDir() ).absolutePath()
-						.toLatin1().constData() );
+						.toLocal8Bit().constData() );
 #ifndef LMMS_DEBUG
 		Stk::showWarnings( false );
 #endif
@@ -718,7 +718,7 @@ malletsSynth::malletsSynth( const StkFloat _pitch,
 	{
 		Stk::setSampleRate( _sample_rate );
 		Stk::setRawwavePath( QDir( ConfigManager::inst()->stkDir() ).absolutePath()
-						.toLatin1().constData() );
+						.toLocal8Bit().constData() );
 #ifndef LMMS_DEBUG
 		Stk::showWarnings( false );
 #endif
diff --git a/plugins/vst_base/RemoteVstPlugin.cpp b/plugins/vst_base/RemoteVstPlugin.cpp
index a51ac9d9a..174a80caa 100644
--- a/plugins/vst_base/RemoteVstPlugin.cpp
+++ b/plugins/vst_base/RemoteVstPlugin.cpp
@@ -88,6 +88,7 @@ struct ERect
 #include "lmms_basics.h"
 #include "Midi.h"
 #include "communication.h"
+#include "IoHelper.h"
 
 #include "VstSyncData.h"
 
@@ -678,9 +679,9 @@ void RemoteVstPlugin::init( const std::string & _plugin_file )
 
 
 
-static void close_check( int fd )
+static void close_check( FILE* fp )
 {
-	if( close( fd ) )
+	if( fclose( fp ) )
 	{
 		perror( "close" );
 	}
@@ -790,7 +791,7 @@ void RemoteVstPlugin::destroyEditor()
 
 bool RemoteVstPlugin::load( const std::string & _plugin_file )
 {
-	if( ( m_libInst = LoadLibrary( _plugin_file.c_str() ) ) == NULL )
+	if( ( m_libInst = LoadLibraryW( toWString(_plugin_file).c_str() ) ) == NULL )
 	{
 		// give VstPlugin class a chance to start 32 bit version of RemoteVstPlugin
 		if( GetLastError() == ERROR_BAD_EXE_FORMAT )
@@ -1072,13 +1073,13 @@ void RemoteVstPlugin::saveChunkToFile( const std::string & _file )
 		const int len = pluginDispatch( 23, 0, 0, &chunk );
 		if( len > 0 )
 		{
-			int fd = open( _file.c_str(), O_WRONLY | O_BINARY );
-			if ( ::write( fd, chunk, len ) != len )
+			FILE* fp = F_OPEN_UTF8( _file, "wb" );
+			if ( fwrite( chunk, len, 1, fp ) != len )
 			{
 				fprintf( stderr,
 					"Error saving chunk to file.\n" );
 			}
-			close_check( fd );
+			close_check( fp );
 		}
 	}
 }
@@ -1237,7 +1238,7 @@ void RemoteVstPlugin::savePreset( const std::string & _file )
 	if (!isPreset &&!chunky) uIntToFile = (unsigned int) m_plugin->numPrograms;
 	pBank->numPrograms = endian_swap( uIntToFile );
 
-	FILE * stream = fopen( _file.c_str(), "w" );
+	FILE * stream = F_OPEN_UTF8( _file, "w" );
 	fwrite ( pBank, 1, 28, stream );
 	fwrite ( progName, 1, isPreset ? 28 : 128, stream );
 	if ( chunky ) {
@@ -1289,7 +1290,7 @@ void RemoteVstPlugin::loadPresetFile( const std::string & _file )
 	unsigned int * pLen = new unsigned int[ 1 ];
 	unsigned int len = 0;
 	sBank * pBank = (sBank*) new char[ sizeof( sBank ) ];
-	FILE * stream = fopen( _file.c_str(), "r" );
+	FILE * stream = F_OPEN_UTF8( _file, "r" );
 	if ( fread ( pBank, 1, 56, stream ) != 56 )
 	{
 		fprintf( stderr, "Error loading preset file.\n" );
@@ -1390,12 +1391,12 @@ void RemoteVstPlugin::loadChunkFromFile( const std::string & _file, int _len )
 {
 	char * chunk = new char[_len];
 
-	const int fd = open( _file.c_str(), O_RDONLY | O_BINARY );
-	if ( ::read( fd, chunk, _len ) != _len )
+	FILE* fp = F_OPEN_UTF8( _file, "rb" );
+	if ( fread( chunk, 1, _len, fp ) != _len )
 	{
 		fprintf( stderr, "Error loading chunk from file.\n" );
 	}
-	close_check( fd );
+	close_check( fp );
 
 	pluginDispatch( effSetChunk, 0, _len, chunk );
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cd3a37fcc..23be36820 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -139,7 +139,7 @@ SET(LMMS_REQUIRED_LIBS ${LMMS_REQUIRED_LIBS}
 	${SDL2_LIBRARY}
 	${PORTAUDIO_LIBRARIES}
 	${SOUNDIO_LIBRARY}
-	${SNDIO_LIBRARY}
+	${SNDIO_LIBRARIES}
 	${PULSEAUDIO_LIBRARIES}
 	${JACK_LIBRARIES}
 	${OGGVORBIS_LIBRARIES}
diff --git a/src/core/DrumSynth.cpp b/src/core/DrumSynth.cpp
index 3379f1aa7..cfa85ceb6 100644
--- a/src/core/DrumSynth.cpp
+++ b/src/core/DrumSynth.cpp
@@ -26,11 +26,13 @@
 
 #include "DrumSynth.h"
 
-#include <fstream>
+#include <sstream>
 #include <cstring>
 
 #include <math.h>     //sin(), exp(), etc.
 
+#include <QFile>
+
 #ifdef LMMS_BUILD_WIN32
 #define powf pow
 #endif
@@ -117,7 +119,7 @@ void DrumSynth::UpdateEnv(int e, long t)
 }
 
 
-void DrumSynth::GetEnv(int env, const char *sec, const char *key, const char *ini)
+void DrumSynth::GetEnv(int env, const char *sec, const char *key, QString ini)
 {
   char en[256], s[8];
   int i=0, o=0, ep=0;
@@ -167,9 +169,9 @@ float DrumSynth::waveform(float ph, int form)
 }
 
 
-int DrumSynth::GetPrivateProfileString(const char *sec, const char *key, const char *def, char *buffer, int size, const char *file)
+int DrumSynth::GetPrivateProfileString(const char *sec, const char *key, const char *def, char *buffer, int size, QString file)
 {
-    ifstream is;
+    stringstream is;
     bool inSection = false;
     char *line;
     char *k, *b;
@@ -177,7 +179,12 @@ int DrumSynth::GetPrivateProfileString(const char *sec, const char *key, const c
 
     line = (char*)malloc(200);
 
-    is.open (file, ifstream::in);
+    // Use QFile to handle unicode file name on Windows
+    // Previously we used ifstream directly
+    QFile f(file);
+    f.open(QIODevice::ReadOnly);
+    QByteArray dat = f.readAll().constData();
+    is.str(string(dat.constData(), dat.size()));
 
     while (is.good()) {
         if (!inSection) {
@@ -223,13 +230,12 @@ int DrumSynth::GetPrivateProfileString(const char *sec, const char *key, const c
         strncpy(buffer, def, size);
     }
 
-    is.close();
     free(line);
 
     return len;
 }
 
-int DrumSynth::GetPrivateProfileInt(const char *sec, const char *key, int def, const char *file)
+int DrumSynth::GetPrivateProfileInt(const char *sec, const char *key, int def, QString file)
 {
   char tmp[16];
   int i=0;
@@ -240,7 +246,7 @@ int DrumSynth::GetPrivateProfileInt(const char *sec, const char *key, int def, c
   return i;
 }
 
-float DrumSynth::GetPrivateProfileFloat(const char *sec, const char *key, float def, const char *file)
+float DrumSynth::GetPrivateProfileFloat(const char *sec, const char *key, float def, QString file)
 {
     char tmp[16];
     float f=0.f;
@@ -257,7 +263,7 @@ float DrumSynth::GetPrivateProfileFloat(const char *sec, const char *key, float
 //  an associative array or something once we have a datastructure to load in to.
 //  llama
 
-int DrumSynth::GetDSFileSamples(const char *dsfile, int16_t *&wave, int channels, sample_rate_t Fs)
+int DrumSynth::GetDSFileSamples(QString dsfile, int16_t *&wave, int channels, sample_rate_t Fs)
 {
   //input file
   char sec[32];
diff --git a/src/core/SampleBuffer.cpp b/src/core/SampleBuffer.cpp
index 9cde88cf5..76afa5599 100644
--- a/src/core/SampleBuffer.cpp
+++ b/src/core/SampleBuffer.cpp
@@ -175,11 +175,6 @@ void SampleBuffer::update( bool _keep_settings )
 	else if( !m_audioFile.isEmpty() )
 	{
 		QString file = tryToMakeAbsolute( m_audioFile );
-#ifdef LMMS_BUILD_WIN32
-		char * f = qstrdup( file.toLocal8Bit().constData() );
-#else
-		char * f = qstrdup( file.toUtf8().constData() );
-#endif
 		int_sample_t * buf = NULL;
 		sample_t * fbuf = NULL;
 		ch_cnt_t channels = DEFAULT_CHANNELS;
@@ -193,10 +188,13 @@ void SampleBuffer::update( bool _keep_settings )
 		}
 		else
 		{
+			// Use QFile to handle unicode file names on Windows
+			QFile f(file);
+			f.open(QIODevice::ReadOnly);
 			SNDFILE * snd_file;
 			SF_INFO sf_info;
 			sf_info.format = 0;
-			if( ( snd_file = sf_open( f, SFM_READ, &sf_info ) ) != NULL )
+			if( ( snd_file = sf_open_fd( f.handle(), SFM_READ, &sf_info, false ) ) != NULL )
 			{
 				f_cnt_t frames = sf_info.frames;
 				int rate = sf_info.samplerate;
@@ -206,6 +204,7 @@ void SampleBuffer::update( bool _keep_settings )
 				}
 				sf_close( snd_file );
 			}
+			f.close();
 		}
 
 		if( !fileLoadError )
@@ -216,28 +215,26 @@ void SampleBuffer::update( bool _keep_settings )
 			// decoder first if filename extension matches "ogg"
 			if( m_frames == 0 && fileInfo.suffix() == "ogg" )
 			{
-				m_frames = decodeSampleOGGVorbis( f, buf, channels, samplerate );
+				m_frames = decodeSampleOGGVorbis( file, buf, channels, samplerate );
 			}
 #endif
 			if( m_frames == 0 )
 			{
-				m_frames = decodeSampleSF( f, fbuf, channels,
+				m_frames = decodeSampleSF( file, fbuf, channels,
 									samplerate );
 			}
 #ifdef LMMS_HAVE_OGGVORBIS
 			if( m_frames == 0 )
 			{
-				m_frames = decodeSampleOGGVorbis( f, buf, channels,
+				m_frames = decodeSampleOGGVorbis( file, buf, channels,
 									samplerate );
 			}
 #endif
 			if( m_frames == 0 )
 			{
-				m_frames = decodeSampleDS( f, buf, channels,
+				m_frames = decodeSampleDS( file, buf, channels,
 									samplerate );
 			}
-
-			delete[] f;
 		}
 
 		if ( m_frames == 0 || fileLoadError )  // if still no frames, bail
@@ -393,7 +390,7 @@ void SampleBuffer::normalizeSampleRate( const sample_rate_t _src_sr,
 
 
 
-f_cnt_t SampleBuffer::decodeSampleSF( const char * _f,
+f_cnt_t SampleBuffer::decodeSampleSF(QString _f,
 					sample_t * & _buf,
 					ch_cnt_t & _channels,
 					sample_rate_t & _samplerate )
@@ -404,7 +401,11 @@ f_cnt_t SampleBuffer::decodeSampleSF( const char * _f,
 	f_cnt_t frames = 0;
 	bool sf_rr = false;
 
-	if( ( snd_file = sf_open( _f, SFM_READ, &sf_info ) ) != NULL )
+
+	// Use QFile to handle unicode file names on Windows
+	QFile f(_f);
+	f.open(QIODevice::ReadOnly);
+	if( ( snd_file = sf_open_fd( f.handle(), SFM_READ, &sf_info, false ) ) != NULL )
 	{
 		frames = sf_info.frames;
 
@@ -430,6 +431,8 @@ f_cnt_t SampleBuffer::decodeSampleSF( const char * _f,
 				"sample %s: %s", _f, sf_strerror( NULL ) );
 #endif
 	}
+	f.close();
+
 	//write down either directly or convert i->f depending on file type
 
 	if ( frames > 0 && _buf != NULL )
@@ -495,7 +498,7 @@ long qfileTellCallback( void * _udata )
 
 
 
-f_cnt_t SampleBuffer::decodeSampleOGGVorbis( const char * _f,
+f_cnt_t SampleBuffer::decodeSampleOGGVorbis( QString _f,
 						int_sample_t * & _buf,
 						ch_cnt_t & _channels,
 						sample_rate_t & _samplerate )
@@ -591,7 +594,7 @@ f_cnt_t SampleBuffer::decodeSampleOGGVorbis( const char * _f,
 
 
 
-f_cnt_t SampleBuffer::decodeSampleDS( const char * _f,
+f_cnt_t SampleBuffer::decodeSampleDS( QString _f,
 						int_sample_t * & _buf,
 						ch_cnt_t & _channels,
 						sample_rate_t & _samplerate )
diff --git a/src/core/audio/AudioFileWave.cpp b/src/core/audio/AudioFileWave.cpp
index 45e46b838..8a590a8b8 100644
--- a/src/core/audio/AudioFileWave.cpp
+++ b/src/core/audio/AudioFileWave.cpp
@@ -27,6 +27,9 @@
 #include "endian_handling.h"
 #include "Mixer.h"
 
+#include <QFile>
+#include <QDebug>
+
 
 AudioFileWave::AudioFileWave( OutputSettings const & outputSettings,
 				const ch_cnt_t channels, bool & successful,
@@ -72,13 +75,15 @@ bool AudioFileWave::startEncoding()
 		m_si.format |= SF_FORMAT_PCM_16;
 		break;
 	}
-	m_sf = sf_open(
-#ifdef LMMS_BUILD_WIN32
-					outputFile().toLocal8Bit().constData(),
-#else
-					outputFile().toUtf8().constData(),
-#endif
-					SFM_WRITE, &m_si );
+
+	// Use file handle to handle unicode file name on Windows
+	m_sf = sf_open_fd( outputFileHandle(), SFM_WRITE, &m_si, false );
+
+	if (!m_sf)
+	{
+		qWarning("Error: AudioFileWave::startEncoding: %s", sf_strerror(nullptr));
+		return false;
+	}
 
 	// Prevent fold overs when encountering clipped data
 	sf_command(m_sf, SFC_SET_CLIPPING, NULL, SF_TRUE);
diff --git a/src/core/midi/MidiWinMM.cpp b/src/core/midi/MidiWinMM.cpp
index a59ebc69e..ef60f3015 100644
--- a/src/core/midi/MidiWinMM.cpp
+++ b/src/core/midi/MidiWinMM.cpp
@@ -248,9 +248,13 @@ void MidiWinMM::closeDevices()
 	m_outputSubs.clear();
 
 	QMapIterator<HMIDIIN, QString> i( m_inputDevices );
+
+	HMIDIIN hInDev;
 	while( i.hasNext() )
 	{
-		midiInClose( i.next().key() );
+		hInDev = i.next().key();
+		midiInReset( hInDev );
+		midiInClose( hInDev );
 	}
 
 	QMapIterator<HMIDIOUT, QString> o( m_outputDevices );
diff --git a/src/gui/MainApplication.cpp b/src/gui/MainApplication.cpp
index 5210dd76c..994ae2771 100644
--- a/src/gui/MainApplication.cpp
+++ b/src/gui/MainApplication.cpp
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2017-2017 Tres Finocchiaro <tres.finocchiaro/at/gmail.com>
  *
- * This file is part of LMMS - http://lmms.io
+ * This file is part of LMMS - https://lmms.io
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
diff --git a/src/gui/MainWindow.cpp b/src/gui/MainWindow.cpp
index 8f2fd4bad..35728d25e 100644
--- a/src/gui/MainWindow.cpp
+++ b/src/gui/MainWindow.cpp
@@ -75,7 +75,7 @@ void disableAutoKeyAccelerators(QWidget* mainWindow)
 {
 	using DisablerFunc = void(*)(QWidget*);
 	QLibrary kf5WidgetsAddon("KF5WidgetsAddons", 5);
-	DisablerFunc setNoAccelerators = 
+	DisablerFunc setNoAccelerators =
 			reinterpret_cast<DisablerFunc>(kf5WidgetsAddon.resolve("_ZN19KAcceleratorManager10setNoAccelEP7QWidget"));
 	if(setNoAccelerators)
 	{
@@ -720,7 +720,7 @@ void MainWindow::clearKeyModifiers()
 
 void MainWindow::saveWidgetState( QWidget * _w, QDomElement & _de )
 {
-	// If our widget is the main content of a window (e.g. piano roll, FxMixer, etc), 
+	// If our widget is the main content of a window (e.g. piano roll, FxMixer, etc),
 	// we really care about the position of the *window* - not the position of the widget within its window
 	if( _w->parentWidget() != NULL &&
 			_w->parentWidget()->inherits( "QMdiSubWindow" ) )
@@ -728,7 +728,7 @@ void MainWindow::saveWidgetState( QWidget * _w, QDomElement & _de )
 		_w = _w->parentWidget();
 	}
 
-	// If the widget is a SubWindow, then we can make use of the getTrueNormalGeometry() method that 
+	// If the widget is a SubWindow, then we can make use of the getTrueNormalGeometry() method that
 	// performs the same as normalGeometry, but isn't broken on X11 ( see https://bugreports.qt.io/browse/QTBUG-256 )
 	SubWindow *asSubWindow = qobject_cast<SubWindow*>(_w);
 	QRect normalGeom = asSubWindow != nullptr ? asSubWindow->getTrueNormalGeometry() : _w->normalGeometry();
@@ -757,7 +757,7 @@ void MainWindow::restoreWidgetState( QWidget * _w, const QDomElement & _de )
 			qMax( _w->minimumHeight(), _de.attribute( "height" ).toInt() ) );
 	if( _de.hasAttribute( "visible" ) && !r.isNull() )
 	{
-		// If our widget is the main content of a window (e.g. piano roll, FxMixer, etc), 
+		// If our widget is the main content of a window (e.g. piano roll, FxMixer, etc),
 		// we really care about the position of the *window* - not the position of the widget within its window
 		if ( _w->parentWidget() != NULL &&
 			_w->parentWidget()->inherits( "QMdiSubWindow" ) )
@@ -856,7 +856,7 @@ void MainWindow::updateRecentlyOpenedProjectsMenu()
 	for( QStringList::iterator it = rup.begin(); it != rup.end(); ++it )
 	{
 		QFileInfo recentFile( *it );
-		if ( recentFile.exists() && 
+		if ( recentFile.exists() &&
 				*it != ConfigManager::inst()->recoveryFile() )
 		{
 			if( recentFile.suffix().toLower() == "mpt" )
@@ -901,15 +901,15 @@ bool MainWindow::saveProject()
 	{
 		return( saveProjectAs() );
 	}
-	else
+	else if( this->guiSaveProject() )
 	{
-		this->guiSaveProject();
 		if( getSession() == Recover )
 		{
 			sessionCleanup();
 		}
+		return true;
 	}
-	return( true );
+	return false;
 }
 
 
@@ -955,14 +955,16 @@ bool MainWindow::saveProjectAs()
 				}
 			}
 		}
-		this->guiSaveProjectAs( fname );
-		if( getSession() == Recover )
+		if( this->guiSaveProjectAs( fname ) )
 		{
-			sessionCleanup();
+			if( getSession() == Recover )
+			{
+				sessionCleanup();
+			}
+			return true;
 		}
-		return( true );
 	}
-	return( false );
+	return false;
 }
 
 
@@ -980,8 +982,7 @@ bool MainWindow::saveProjectAsNewVersion()
 		do 		VersionedSaveDialog::changeFileNameVersion( fileName, true );
 		while 	( QFile( fileName ).exists() );
 
-		this->guiSaveProjectAs( fileName );
-		return true;
+		return this->guiSaveProjectAs( fileName );
 	}
 }