What The F!!!.mkv.mp4 Access

: If you are expecting a video but the file is actually an executable (like .exe hidden by a fake .mp4 name), running it could install malware. Always verify the file type in your system's "Properties" or "Get Info" menu before opening. 3. "Remuxed" Metadata

It is very common for users or automated tools to rename a file rather than properly converting it. What The F!!!.mkv.mp4

: Someone had a high-quality MKV file (Matroska Video) and wanted to make it compatible with a device that only supports MP4 . : If you are expecting a video but