Providing the source where you saw the name will help narrow down the specific "lore" behind it.
Messaging platforms often rename files during the "save to gallery" process if the original metadata is stripped. b_045.mp4
If you found this on an old drive, you likely need a media player with heavy codec support (like VLC Media Player ) to open it, as recovered files are often partially corrupted. 3. Messaging App Downloads (Telegram/Discord) Providing the source where you saw the name
In a technical sense, a file named b_045.mp4 is frequently the result of or recovery tools (like PhotoRec). b_045.mp4