diff --git a/src/factory.c b/src/factory.c
index 06bc61a1..c82f9015 100644
--- a/src/factory.c
+++ b/src/factory.c
@@ -62,9 +62,6 @@ char * Bound_script[10];
 #include <limits.h> //for INT_MIN
 #include <string.h> // strncpy()
 #include <stdlib.h> // for atof()
-#if defined(WIN32)
-#include <windows.h>
-#endif
 #if defined(_MSC_VER)
 #define strdup _strdup
 #define putenv _putenv
@@ -2002,30 +1999,16 @@ int L_GetFileName(lua_State* L)
   else
   {
     // convert Filename_unicode to UTF8 (Lua strings are 8bits)
-    size_t unicode_len = Unicode_strlen(Main.backups->Pages->Filename_unicode);
-    int len = WideCharToMultiByte(CP_UTF8, 0, Main.backups->Pages->Filename_unicode, unicode_len, NULL, 0, NULL, NULL);
-    if (len <= 0)
+    size_t len = 0;
+    char * utf8name = Unicode_to_utf8(Main.backups->Pages->Filename_unicode, &len);
+    if (utf8name == NULL)
     {
-      GFX2_Log(GFX2_WARNING, "WideCharToMultiByte() failed\n");
       lua_pushstring(L, Main.backups->Pages->Filename);
     }
     else
     {
-      char * utf8name = (char *)GFX2_malloc(len);
-      if (utf8name == NULL)
-        lua_pushstring(L, Main.backups->Pages->Filename);
-      else
-      {
-        if (WideCharToMultiByte(CP_UTF8, 0, Main.backups->Pages->Filename_unicode, unicode_len, utf8name, len, NULL, NULL) > 0)
-          lua_pushlstring(L, utf8name, len);
-        else
-        {
-          DWORD error = GetLastError();
-          GFX2_Log(GFX2_WARNING, "WideCharToMultiByte() failed error=%u\n", error);
-          lua_pushstring(L, Main.backups->Pages->Filename);
-        }
-        free(utf8name);
-      }
+      lua_pushlstring(L, utf8name, len);
+      free(utf8name);
     }
   }
   // still using the "short name" directory path at the moment
diff --git a/src/osdep.c b/src/osdep.c
index 79bbe33e..80445230 100644
--- a/src/osdep.c
+++ b/src/osdep.c
@@ -22,6 +22,11 @@
     You should have received a copy of the GNU General Public License
     along with Grafx2; if not, see <http://www.gnu.org/licenses/>
 */
+//////////////////////////////////////////////////////////////////////////////
+///@file osdep.c
+/// OS Dependend code
+//////////////////////////////////////////////////////////////////////////////
+
 #if defined(USE_SDL) || defined(USE_SDL2)
 #include <SDL.h>
 #elif !defined(WIN32)
@@ -59,7 +64,9 @@
 #endif
 
 #include "struct.h"
+#include "unicode.h"
 #include "gfx2log.h"
+#include "gfx2mem.h"
 
 dword GFX2_GetTicks(void)
 {
@@ -253,3 +260,39 @@ unsigned long Memory_free(void)
 #endif
 }
 #endif
+
+#if defined(WIN32)
+/**
+ * Converts an unicode string to UTF8
+ * @param str the unicode string
+ * @param utf8len pointer to receive the utf8 string length (excluding null terminator)
+ * @return malloc'ed UTF8 string
+ */
+char * Unicode_to_utf8(const word * str, size_t * utf8len)
+{
+  size_t unicode_len = Unicode_strlen(str);
+  int len = WideCharToMultiByte(CP_UTF8, 0, str, unicode_len, NULL, 0, NULL, NULL);
+  if (len <= 0)
+  {
+    GFX2_Log(GFX2_WARNING, "WideCharToMultiByte() failed\n");
+    return NULL;
+  }
+  else
+  {
+    char * utf8 = (char *)GFX2_malloc(len+1);
+    if (utf8 == NULL)
+      return NULL;
+    if (WideCharToMultiByte(CP_UTF8, 0, str, unicode_len, utf8, len, NULL, NULL) <= 0)
+    {
+      DWORD error = GetLastError();
+      GFX2_Log(GFX2_WARNING, "WideCharToMultiByte() failed error=%u\n", error);
+      free(utf8);
+      return NULL;
+    }
+    if (utf8len != NULL)
+      *utf8len = (size_t)len;
+    utf8[len] = '\0';
+    return utf8;
+  }
+}
+#endif
diff --git a/src/osdep.h b/src/osdep.h
index 2a6a6cfb..3446c55d 100644
--- a/src/osdep.h
+++ b/src/osdep.h
@@ -54,4 +54,8 @@ void Atari_Memory_free(unsigned long *stRam, unsigned long *ttRam);
 unsigned long Memory_free(void);
 #endif
 
+#if defined(WIN32)
+char * Unicode_to_utf8(const word * str, size_t * utf8len);
+#endif
+
 #endif