Fix file names with exts chars on Windows for mlt_properties.
Fix file names with exts chars on Windows for mlt_frame.
Fix file names with exts chars on Windows for melt file.
Revert "Fix file names with exts chars on Windows for mlt_frame."

This reverts commit fad00e50f8acd766ff472d0b3fb6a78f1b4d50fb.