diff --git a/src/miniz/miniz.c b/src/miniz/miniz.c
index 9ded4c75a..8f5b97679 100644
--- a/src/miniz/miniz.c
+++ b/src/miniz/miniz.c
@@ -2987,17 +2987,43 @@ extern "C" {
 #include <sys/stat.h>
 
 #if defined(_MSC_VER) || defined(__MINGW64__)
+
+#include <windows.h>
+
+struct WArgs { const wchar_t *fname, *mode; };
+static struct WArgs utf8towide(const char* fname_utf8, const char * modestr)
+{
+    static wchar_t buff[4096];
+    static wchar_t mode[50];
+    struct WArgs ret = { .fname = NULL, .mode = NULL };
+
+    if(MultiByteToWideChar(CP_UTF8, 0, fname_utf8, -1, buff, 4096) == 0)
+        return ret;
+
+    if(MultiByteToWideChar(CP_UTF8, 0, modestr, -1, mode, 50) == 0)
+        return ret;
+
+    ret.fname = buff, ret.mode = mode;
+    return ret;
+}
 static FILE *mz_fopen(const char *pFilename, const char *pMode)
 {
     FILE *pFile = NULL;
-    fopen_s(&pFile, pFilename, pMode);
+
+    struct WArgs args = utf8towide(pFilename, pMode);
+    if(args.fname != NULL && args.mode != NULL)
+        if(_wfopen_s(&pFile, args.fname, args.mode)) return NULL;
+
     return pFile;
 }
 static FILE *mz_freopen(const char *pPath, const char *pMode, FILE *pStream)
 {
     FILE *pFile = NULL;
-    if (freopen_s(&pFile, pPath, pMode, pStream))
-        return NULL;
+
+    struct WArgs args = utf8towide(pPath, pMode);
+    if(args.fname != NULL && args.mode != NULL)
+        if(_wfreopen_s(&pFile, args.fname, args.mode, pStream)) return NULL;
+
     return pFile;
 }
 #ifndef MINIZ_NO_TIME