THANK YOU Matti -- yes, I have tried that...and it does indeed open with VLC if I open it immediately. But my basic problem is that when I insert that same video (with the previous instructions to ALWAYS use VLC to open, and VLC IS already the default for all other videos) into a Keynote slide and press play, the subtitles do not appear...so I am assuming that Keynote was forcing Quicktime to play it? It ONLY does this with the latest 14.1 version of Keynote, it has worked fine in older versions of Keynote. And of course I cannot find a way to download an older version of Keynote to solve my problem...and all older versions of Keynote were upgraded on all my laptops because it is in the Cloud 😱 Somewhere I read that Quicktime is the default for Keynote..? BTW, I tried converting the video to .MOV -- did not fix it. ANY other suggestions you might have will be gratefully received 😊