XnView Software

Ah, so it's a "̶W̶h̶a̶t̶'̶s̶ ̶d̶i̶f̶f̶e̶r̶e̶n̶t̶ ̶i̶n̶ ̶X̶n̶V̶i̶e̶w̶ ̶M̶P̶"̶ "Missing features (compared to XnView Classic)" item. I had checked there but didn't spot it.
Good to know it's expected behavior, thanks for the reply!

edit: fixed features thread title

Running XnViewMP Version 1.3.1 64bits on Windows 10, and the Slideshow feature seems unable to show video files. A search of the forums here shows posts by other users that suggests that videos work in their slideshows, so I assume it's a feature that should be working.

I've tried various ...