Use media players like VLC Media Player (plays anything), QuickTime (Mac), or Windows Media Player.

did you get this file from (e.g., a specific app, browser, or website)? What is the issue (e.g., won't open, wrong format)? Knowing this will help me give you a better solution!

Sites like twittervideodownloader.com or twdown.net (use caution with ads).

(10) Mp4 - Twitter

Use media players like VLC Media Player (plays anything), QuickTime (Mac), or Windows Media Player.

did you get this file from (e.g., a specific app, browser, or website)? What is the issue (e.g., won't open, wrong format)? Knowing this will help me give you a better solution!

Sites like twittervideodownloader.com or twdown.net (use caution with ads).