Numerical filenames like this are often temporary. If this was a downloaded file, checking your browser history or download manager may provide the original website link. MediaInfo - MediaArea
: For a deep technical dive, tools like MediaInfo or Metadata2Go can show the exact codec , bitrate , and sometimes the GPS location or camera model used to record it. 3742579755728.mp4
: Right-click the file, select Properties , and go to the Details tab. This may show the date created, resolution, and sometimes the program or device that made it. Mac : Right-click the file and select Get Info . Numerical filenames like this are often temporary