301.mkv.mp4 -

Most operating systems hide the final extension. If the file is "301.mkv.mp4," the computer treats it as an MP4 .

High-quality Blu-ray rips are usually MKV; converting them to MP4 allows them to play on iPhones, iPads, and gaming consoles without third-party apps. 3. Software Tutorials 301.mkv.mp4

If you are trying to open or use this file, follow these steps: Most operating systems hide the final extension