: If the default player fails, download the VLC Media Player. It supports almost all video codecs and is highly recommended for unknown or stubborn files. Identifying the Content
: Use QuickTime Player or Adobe Creative Cloud tools if editing is required. 762777.mp4
If you are unsure what the video contains, check the following: : If the default player fails, download the VLC Media Player
: Ensure it isn't a "double extension" file (e.g., 762777.mp4.exe ), which is often malware disguised as a video. : If the default player fails
Could you share or its file size ? That would help narrow down exactly what "762777" refers to. How to play MP4 files in Windows - Microsoft Support