Double extensions are a classic trick used to hide a file's true nature.
: By default, Windows often hides "known file extensions." A file named What The F!!!.mkv.mp4 might appear to a user simply as What The F!!!.mkv . What The F!!!.mkv.mp4
Creators then "remux" (wrap) that MKV data into an container for easier editing in software like Adobe Premiere or DaVinci Resolve. Double extensions are a classic trick used to
Archiving, high-quality movies, multiple audio/subtitle tracks. Streaming, sharing, and mobile device compatibility. Typically lossless; supports almost any codec. multiple audio/subtitle tracks. Streaming