12q3d42w3f4w.mp4

The string 12q3d42w3f4w is likely a Base64 encoded ID or a Hash .

If found in a temporary folder, it may be a cached segment of a video streamed from a site like TikTok or Instagram. 12q3d42w3f4w.mp4

Open the file in VLC Media Player . Go to Tools > Codec Information . This will tell you the resolution (e.g., 1080p), frame rate, and the software used to encode it. The string 12q3d42w3f4w is likely a Base64 encoded

A file named like this generally originates from one of four sources: 12q3d42w3f4w.mp4