cdfinder, (edited ) 
Q: Is there a way to find files by extension with #NeoFinder?
A: Yes, the powerful Find Editor can do that and a lot more.
Use the "Name ... ends with" parameter, and add the period to the suffix to search for, w.g. ".mp4".
https://www.neofinder.de/forum/phpBB3/viewtopic.php?t=261
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