OBS Studio defaults to this naming convention ( YYYY-MM-DD HH-MM-SS.mkv ). This specific file would represent a session recorded in the early morning hours of August 7, 2021.
If you found this file on your computer or a shared drive, it is most likely: 2021-08-07 03-37-54.mkv
Use a tool like MediaInfo to see the technical metadata (resolution, frame rate, and what software encoded it). OBS Studio defaults to this naming convention (
.mkv (Matroska Video), a container often used for high-quality recordings, multiple audio tracks, or subtitle streams. Likely Origins multiple audio tracks