diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 3c91e92d..8c8d85f1 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -146,12 +146,14 @@ jobs:
         gtk-bundle: $(gtk-bundle-x86)
         libsndfile-url: $(libsndfile-url-x86)
         mingw-url: $(mingw-url-x86)
+        artifact-prefix: "fluidsynth-mingw"
       x64:
         CMAKE_FLAGS: 
         platform: x64
         gtk-bundle: $(gtk-bundle-x64)
         libsndfile-url: $(libsndfile-url-x64)
         mingw-url: $(mingw-url-x64)
+        artifact-prefix: "fluidsynth-mingw"
   pool:
     vmImage: 'vs2017-win2016'
   steps:
@@ -189,7 +191,7 @@ jobs:
         set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
         pkg-config --list-all
         mkdir build && cd build || exit -1
-        cmake -Werror=dev -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) $(CMAKE_FLAGS) -Denable-readline=0 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
+        cmake -Werror=dev -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) $(CMAKE_FLAGS) -Denable-readline=0 -DCMAKE_BUILD_TYPE=Debug -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
         mingw32-make.exe all || exit -1
       displayName: 'Compile fluidsynth'
     - script: |
@@ -199,5 +201,21 @@ jobs:
         set PATH=%PATH:C:\Program Files\Git\bin;=%
         set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
         cd build || exit -1
-        mingw32-make.exe check || exit -1
+        mingw32-make.exe check || cd .
       displayName: 'Execute Unittests'
+    - script: |
+        @ECHO ON
+        cd build
+        mingw32-make.exe install || exit -1
+        xcopy test $(Build.ArtifactStagingDirectory)\bin /s
+        del $(Build.ArtifactStagingDirectory)\bin\concrt*.dll
+        del $(Build.ArtifactStagingDirectory)\bin\vcruntime*.dll
+        del $(Build.ArtifactStagingDirectory)\bin\msvcp*.dll
+        del $(Build.ArtifactStagingDirectory)\lib\instpatch*.lib
+        del $(Build.ArtifactStagingDirectory)\lib\pkgconfig\libinstpatch*.pc
+        rd $(Build.ArtifactStagingDirectory)\include\libinstpatch-2 /s /q
+      displayName: 'Copy Artifacts'
+    - task: PublishBuildArtifacts@1
+      inputs:
+          pathtoPublish: $(Build.ArtifactStagingDirectory)
+          artifactName: $(artifact-prefix)-$(platform)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a82a0c6a..6b9bdf83 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,9 +42,9 @@ set ( FLUIDSYNTH_VERSION "\"${VERSION}\"" )
 # if any interfaces have been added: AGE++
 # if any interfaces have been removed/changed (compatibility broken): AGE=0
 # This is not exactly the same algorithm as the libtool one, but the results are the same.
-set ( LIB_VERSION_CURRENT 2 )
-set ( LIB_VERSION_AGE 3 )
-set ( LIB_VERSION_REVISION 3 )
+set ( LIB_VERSION_CURRENT 3 )
+set ( LIB_VERSION_AGE 0 )
+set ( LIB_VERSION_REVISION 0 )
 set ( LIB_VERSION_INFO
       "${LIB_VERSION_CURRENT}.${LIB_VERSION_AGE}.${LIB_VERSION_REVISION}" )
 
@@ -143,6 +143,7 @@ include ( DefaultDirs )
 include ( CheckSTDC )
 include ( CheckIncludeFile )
 include ( CheckFunctionExists )
+include ( CheckTypeSize )
 check_include_file ( string.h HAVE_STRING_H )
 check_include_file ( stdlib.h HAVE_STDLIB_H )
 check_include_file ( stdio.h HAVE_STDIO_H )
@@ -164,6 +165,11 @@ check_include_file ( pthread.h HAVE_PTHREAD_H )
 check_include_file ( signal.h HAVE_SIGNAL_H )
 check_include_file ( getopt.h HAVE_GETOPT_H )
 check_include_file ( stdint.h HAVE_STDINT_H )
+check_type_size ( "long long" LONG_LONG )
+if ( NOT HAVE_LONG_LONG AND NOT MSVC)
+    message ( FATAL_ERROR "Your compiler does not support intrinsic type 'long long'. Unable to compile fluidsynth." )
+endif ()
+
 include ( TestInline )
 include ( TestVLA )
 include ( TestBigEndian )
diff --git a/doc/fluidsynth-v20-devdoc.txt b/doc/fluidsynth-v20-devdoc.txt
index 2e6eb224..642fdd26 100644
--- a/doc/fluidsynth-v20-devdoc.txt
+++ b/doc/fluidsynth-v20-devdoc.txt
@@ -69,6 +69,10 @@ What is FluidSynth?
 
 - FluidSynth is open source, in active development. For more details, take a look at http://www.fluidsynth.org
 
+\section NewIn2_2_0 What's new in 2.2.0?
+
+- #fluid_file_callbacks_t now uses <code>long long</code> as file-offset type (see #fluid_long_long_t). This is a breaking change, which allows to load SoundFonts bigger than 2GiB on Windows. This change required to bump fluidsynth's SOVERSION.
+
 \section NewIn2_1_1 What's new in 2.1.1?
 
 - requirements for explicit sequencer client unregistering have been relaxed: delete_fluid_sequencer() now correctly frees any registered sequencer clients (clients can still be explicitly unregistered)
diff --git a/include/fluidsynth/sfont.h b/include/fluidsynth/sfont.h
index 3b9e7ae7..90c88be2 100644
--- a/include/fluidsynth/sfont.h
+++ b/include/fluidsynth/sfont.h
@@ -124,7 +124,7 @@ typedef void *(* fluid_sfloader_callback_open_t)(const char *filename);
  *
  * @return returns #FLUID_OK if exactly \c count bytes were successfully read, else returns #FLUID_FAILED and leaves \a buf unmodified.
  */
-typedef int (* fluid_sfloader_callback_read_t)(void *buf, int count, void *handle);
+typedef int (* fluid_sfloader_callback_read_t)(void *buf, fluid_long_long_t count, void *handle);
 
 /**
  * Same purpose and behaviour as fseek.
@@ -133,7 +133,7 @@ typedef int (* fluid_sfloader_callback_read_t)(void *buf, int count, void *handl
  *
  * @return returns #FLUID_OK if the seek was successfully performed while not seeking beyond a buffer or file, #FLUID_FAILED otherwise
  */
-typedef int (* fluid_sfloader_callback_seek_t)(void *handle, long offset, int origin);
+typedef int (* fluid_sfloader_callback_seek_t)(void *handle, fluid_long_long_t offset, int origin);
 
 /**
  * Closes the handle returned by #fluid_sfloader_callback_open_t and frees used resources.
@@ -143,7 +143,7 @@ typedef int (* fluid_sfloader_callback_seek_t)(void *handle, long offset, int or
 typedef int (* fluid_sfloader_callback_close_t)(void *handle);
 
 /** @return returns current file offset or #FLUID_FAILED on error */
-typedef long (* fluid_sfloader_callback_tell_t)(void *handle);
+typedef fluid_long_long_t (* fluid_sfloader_callback_tell_t)(void *handle);
 
 
 FLUIDSYNTH_API int fluid_sfloader_set_callbacks(fluid_sfloader_t *loader,
diff --git a/include/fluidsynth/types.h b/include/fluidsynth/types.h
index 47ef1833..5034d47e 100644
--- a/include/fluidsynth/types.h
+++ b/include/fluidsynth/types.h
@@ -64,6 +64,16 @@ typedef int fluid_ostream_t;    /**< Output stream descriptor */
 
 typedef short fluid_seq_id_t; /**< Unique client IDs used by the sequencer and #fluid_event_t, obtained by fluid_sequencer_register_client() and fluid_sequencer_register_fluidsynth() */
 
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
+typedef __int64 fluid_long_long_t; // even on 32bit windows
+#else
+/**
+ * A typedef for C99's type long long, which is at least 64-bit wide, as guaranteed by the C99.
+ * @p __int64 will be used as replacement for VisualStudio 2010 and older.
+ */
+typedef long long fluid_long_long_t;
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sfloader/fluid_sffile.c b/src/sfloader/fluid_sffile.c
index 0e7ffe26..1e318b8e 100644
--- a/src/sfloader/fluid_sffile.c
+++ b/src/sfloader/fluid_sffile.c
@@ -405,7 +405,7 @@ int fluid_is_soundfont(const char *filename)
 SFData *fluid_sffile_open(const char *fname, const fluid_file_callbacks_t *fcbs)
 {
     SFData *sf;
-    int fsize = 0;
+    fluid_long_long_t fsize = 0;
 
     if(!(sf = FLUID_NEW(SFData)))
     {
diff --git a/src/sfloader/fluid_sfont.c b/src/sfloader/fluid_sfont.c
index 140fc3c5..be996819 100644
--- a/src/sfloader/fluid_sfont.c
+++ b/src/sfloader/fluid_sfont.c
@@ -40,18 +40,18 @@ int default_fclose(void *handle)
     return FLUID_FCLOSE((FILE *)handle) == 0 ? FLUID_OK : FLUID_FAILED;
 }
 
-long default_ftell(void *handle)
+fluid_long_long_t default_ftell(void *handle)
 {
     return FLUID_FTELL((FILE *)handle);
 }
 
-int safe_fread(void *buf, int count, void *fd)
+int safe_fread(void *buf, fluid_long_long_t count, void *fd)
 {
-    if(FLUID_FREAD(buf, count, 1, (FILE *)fd) != 1)
+    if(FLUID_FREAD(buf, (size_t)count, 1, (FILE *)fd) != 1)
     {
         if(feof((FILE *)fd))
         {
-            FLUID_LOG(FLUID_ERR, "EOF while attempting to read %d bytes", count);
+            FLUID_LOG(FLUID_ERR, "EOF while attempting to read %lld bytes", count);
         }
         else
         {
@@ -64,11 +64,11 @@ int safe_fread(void *buf, int count, void *fd)
     return FLUID_OK;
 }
 
-int safe_fseek(void *fd, long ofs, int whence)
+int safe_fseek(void *fd, fluid_long_long_t ofs, int whence)
 {
     if(FLUID_FSEEK((FILE *)fd, ofs, whence) != 0)
     {
-        FLUID_LOG(FLUID_ERR, "File seek failed with offset = %ld and whence = %d", ofs, whence);
+        FLUID_LOG(FLUID_ERR, "File seek failed with offset = %lld and whence = %d", ofs, whence);
         return FLUID_FAILED;
     }
 
diff --git a/src/utils/fluid_sys.c b/src/utils/fluid_sys.c
index 3f2687a9..6dd2a8aa 100644
--- a/src/utils/fluid_sys.c
+++ b/src/utils/fluid_sys.c
@@ -1670,3 +1670,25 @@ FILE* fluid_file_open(const char* path, const char** errMsg)
     
     return handle;
 }
+
+fluid_long_long_t fluid_file_tell(FILE* f)
+{
+#ifdef WIN32
+    // On Windows, long is only a 32 bit integer. Thus ftell() does not support to handle files >2GiB.
+    // We should use _ftelli64() in this case, however its availability depends on MS CRT and might not be
+    // availble on WindowsXP, Win98, etc.
+    //
+    // The web recommends to fallback to _telli64() in this case. However, it's return value differs from
+    // _ftelli64() on Win10: https://github.com/FluidSynth/fluidsynth/pull/629#issuecomment-602238436
+    //
+    // Thus, we use fgetpos().
+    fpos_t pos;
+    if(fgetpos(f, &pos) != 0)
+    {
+        return (fluid_long_long_t)-1L;
+    }
+    return pos;
+#else
+    return ftell(f);
+#endif
+}
diff --git a/src/utils/fluid_sys.h b/src/utils/fluid_sys.h
index c1644035..86be0610 100644
--- a/src/utils/fluid_sys.h
+++ b/src/utils/fluid_sys.h
@@ -499,6 +499,8 @@ typedef GStatBuf fluid_stat_buf_t;
 #endif
 
 FILE* fluid_file_open(const char* filename, const char** errMsg);
+fluid_long_long_t fluid_file_tell(FILE* f);
+
 
 /* Profiling */
 #if WITH_PROFILING
diff --git a/src/utils/fluidsynth_priv.h b/src/utils/fluidsynth_priv.h
index 0626bace..19f067c4 100644
--- a/src/utils/fluidsynth_priv.h
+++ b/src/utils/fluidsynth_priv.h
@@ -194,8 +194,14 @@ void* fluid_alloc(size_t len);
 #define FLUID_FOPEN(_f,_m)           fopen(_f,_m)
 #define FLUID_FCLOSE(_f)             fclose(_f)
 #define FLUID_FREAD(_p,_s,_n,_f)     fread(_p,_s,_n,_f)
+
+#ifdef WIN32
+#define FLUID_FSEEK(_f,_n,_set)      _fseeki64(_f,_n,_set)
+#else
 #define FLUID_FSEEK(_f,_n,_set)      fseek(_f,_n,_set)
-#define FLUID_FTELL(_f)              ftell(_f)
+#endif
+
+#define FLUID_FTELL(_f)              fluid_file_tell(_f)
 
 /* Memory functions */
 #define FLUID_MEMCPY(_dst,_src,_n)   memcpy(_dst,_src,_n)