Do you remember you originally downloaded this file from? How to play MP4 files in Windows - Microsoft Support
These specific filenames often appear when a user downloads a video using a browser extension or a third-party downloader . Because the original uploader didn't give the file a "real" name (like "Vacation.mp4"), your computer saves it using the cryptic internal ID assigned by the server. 0h147u4bt2fstxh24b4p0_source-erlURZ9j.mp4
If you are looking for the of this video, it is likely a clip shared on a forum or social media site. Since these IDs are unique to specific uploads, you can sometimes find the original post by searching the exact string on the platform where you first saw it. Do you remember you originally downloaded this file from