Does it let me open multiple windows on MacOS yet? For whatever reason, the latest update of the os, forces all MP4 files to "convert" in quicktime. So I had to switch up to VLC. One window at a time is horrible though.
Tools -> Preferences -> Playlist and Instances
"Allow only one instance" and "Use only one instance when started from file manager", uncheck both to allow more than one window at a time all the time.