: You can typically open this file by double-clicking it on most operating systems. If you have trouble, the VLC media player is a highly recommended free tool that supports almost all MP4 variants.
: Likely a unique identifier, timestamp, or database ID assigned by a server or software during download. 12242127-720p (2).mp4
: You can check the "Properties" (Windows) or "Get Info" (Mac) on the file to see the exact bitrate and duration, which determines the actual video quality. MP4 files explained: How to open and use - Adobe : You can typically open this file by