diff --git a/framework/global/io/ifilesystem.h b/framework/global/io/ifilesystem.h
index 7698613872..d5edce6f55 100644
--- a/framework/global/io/ifilesystem.h
+++ b/framework/global/io/ifilesystem.h
@@ -65,7 +65,7 @@ class IFileSystem : MODULE_GLOBAL_INTERFACE
 
     virtual RetVal<ByteArray> readFile(const io::path_t& filePath) const = 0;
     virtual Ret readFile(const io::path_t& filePath, ByteArray& data) const = 0;
-    virtual Ret writeFile(const io::path_t& filePath, const ByteArray& data) = 0;
+    virtual Ret writeFile(const io::path_t& filePath, const ByteArray& data, bool syncToDisk = false) = 0;
 
     //! Streaming write
     virtual RetVal<StreamId> openStream(const io::path_t& filePath, OpenMode mode) = 0;
diff --git a/framework/global/io/internal/filesystem.cpp b/framework/global/io/internal/filesystem.cpp
index 9625b82bbc..da042b622e 100644
--- a/framework/global/io/internal/filesystem.cpp
+++ b/framework/global/io/internal/filesystem.cpp
@@ -21,6 +21,9 @@
  */
 #include "filesystem.h"
 
+#include <cerrno>
+#include <cstring>
+
 #include <QDir>
 #include <QDirIterator>
 #include <QFileInfo>
@@ -29,11 +32,21 @@
 
 #ifdef Q_OS_WIN
 #include <windows.h>
+#include <io.h>
+#else
+#include <unistd.h>
 #endif
 
 #include "../ioretcodes.h"
 #include "log.h"
 
+#ifdef Q_OS_WIN
+//Use _commit instead of FlushFileBuffers since it takes a file descriptor like fsync.
+    #define OS_SYNC_FILE(handle) _commit((handle))
+#else
+    #define OS_SYNC_FILE(handle) fsync((handle))
+#endif
+
 using namespace muse;
 using namespace muse::io;
 
@@ -198,7 +211,7 @@ Ret FileSystem::readFile(const io::path_t& filePath, ByteArray& data) const
     return ret;
 }
 
-Ret FileSystem::writeFile(const io::path_t& filePath, const ByteArray& data)
+Ret FileSystem::writeFile(const io::path_t& filePath, const ByteArray& data, bool syncToDisk)
 {
     Ret ret = muse::make_ok();
 
@@ -223,6 +236,21 @@ Ret FileSystem::writeFile(const io::path_t& filePath, const ByteArray& data)
         return ret;
     }
 
+    if (syncToDisk) {
+        // Flush user-space buffer (Qt/fflush), not a disk sync.
+        // Must be called before OS_SYNC_FILE.
+        file.flush();
+
+        // Ask the OS to push data to disk.
+        // If it fails, we log a warning and proceed —
+        // a failed sync does not necessarily mean the data wasn't written.
+        // At least we tried.
+        if (OS_SYNC_FILE(file.handle()) == -1) {
+            const int errorCode = errno;
+            LOGW() << "Failed to sync file to disk:" << std::strerror(errorCode);
+        }
+    }
+
     file.close();
 
     return ret;
diff --git a/framework/global/io/internal/filesystem.h b/framework/global/io/internal/filesystem.h
index 05a5778336..6879965023 100644
--- a/framework/global/io/internal/filesystem.h
+++ b/framework/global/io/internal/filesystem.h
@@ -55,7 +55,7 @@ class FileSystem : public IFileSystem
 
     RetVal<ByteArray> readFile(const io::path_t& filePath) const override;
     Ret readFile(const io::path_t& filePath, ByteArray& data) const override;
-    Ret writeFile(const io::path_t& filePath, const ByteArray& data) override;
+    Ret writeFile(const io::path_t& filePath, const ByteArray& data, bool syncToDisk = false) override;
 
     RetVal<StreamId> openStream(const io::path_t& filePath, OpenMode mode) override;
     Ret writeToStream(StreamId fileId, const ByteArray& data, uint64_t offset = STREAM_POS_CURRENT) override;