Hi Chris
The files are actually .prores files, ie “filename.prores”. The Mac sees it as a UNIX file, as it does when it doesn’t recognise the file type. It seems that its the output from broadcast system with the audio and video as separate streams, not in a .mov container, if you see what I mean. I’m trying to get in contact with the guy who sent it to me but just wondered if there was a simple solution.