On the surface, it’s a relic. A digital fossil from the era of LimeWire, torrent trackers, and fan-run subtitle forums. But to me, it’s a time machine. And I think, if you’ve ever chased a film across the early internet, you have your own version of this file, too.
The -MM Sub- part probably means or “My subtitles” (maybe hardcoded or external), and .mp4 is the video container. Windstruck -2004- -MM Sub-.mp4
.mp4 is a standard digital container compatible with most modern media players and mobile devices. On the surface, it’s a relic