If your default player fails, try the VLC Media Player , which includes codecs for nearly every type of MP4 encoding.
Beyond video, this file can contain multiple audio tracks, subtitles, and still images. shinx14847 (1)mp4
Most modern smartphones (iOS and Android) support .mp4 natively; simply tap the file in your Photos or Files app. Understanding the Format If your default player fails, try the VLC
The "(1)" in the filename usually indicates it is a duplicate download. You can safely rename it to something more descriptive while keeping the .mp4 extension. How to play MP4 files in Windows - Microsoft Support If your default player fails
If you see an error, the download may have been interrupted. Try downloading the file again from its original source.