Right-click the file and remove the unnecessary .mkv part so it simply ends in .mp4 .
If you tell me you're trying to play this on or what error message you're seeing, I can give you more specific troubleshooting steps. IPX-550.mkv.mp4
If the file won't open, it may be corrupted or a "fake" file (common with oddly named downloads). Right-click the file, select Properties , and check if the file size matches what you expect for a video. 3. Fixing the Extension Right-click the file and remove the unnecessary