If you absolutely must see the content but don't 100% trust it:
Since there is no public data on the specific content of this video, I have drafted a "Useful Guide" blog post below that addresses how to handle, identify, and safely open mysterious MP4 files with randomized names. jxKVf1FVzRi6OXi6jQNpchzDJjSRt.MP4
VLC is more robust against "malformed" files that try to exploit system players like QuickTime or Windows Media Player. 5. Rename for Your Future Self If you absolutely must see the content but
If a friend sent a link, the randomized name is likely just the platform's way of storing it. 3. Use "MediaInfo" to Peek Inside jxKVf1FVzRi6OXi6jQNpchzDJjSRt.MP4