If you found this file on your computer or a shared drive, it is most likely:
If the video won't play, it may be a "broken" recording (common if OBS crashed during the 3:37 AM session). You can try using Untrunc or FFmpeg to repair the header. 2021-08-07 03-37-54.mkv
Files shared on these platforms often retain their original system-generated filenames if they aren't renamed by the uploader. How to "Develop" the Content If you found this file on your computer
Since .mkv is a flexible container, VLC is the most reliable tool to play it regardless of the internal codecs. 2021-08-07 03-37-54.mkv