One of the features I used all the time in ms-explorer was the video-Length (duration) column.
Especially for mp4 video downloads. Maybe a call to ffmpeg when a supported movie-extension is encountered, if not to the ms-api itself (just guessing, don't really know)?
C/C++ circa 2012:
https://stackoverflow.com/questions/645 ... video-file
https://stackoverflow.com/questions/101 ... mov-videos
PS-Script 2019:
https://superuser.com/questions/597626/ ... mmand-line
Just throwing it out there.