Right-click the file, select Properties , and go to the Details tab to see the date created, frame width, and length. On Mac: Right-click the file and select Get Info .

If the file won't open in your default player, the VLC Media Player is a reliable, free tool that can handle almost any MP4 codec.

The naming convention, particularly the addition of (1) , often occurs when you download the same file multiple times to your device, with your computer or phone automatically numbering the copies.

If you have this file and want to know what it is without opening it blindly, you can check its metadata:

If you received this file as an attachment from an unknown sender, it is best not to open it, as unusual filenames can sometimes be used to disguise malicious content.

If you found this in a temporary folder, it may be a cached version of a video you previously viewed on a social media platform. How to View or Identify the Content

Long numerical strings are frequently used by surveillance systems or dashcams to timestamp or serialize video clips.