It would be great if the File / Open Recent... list was sub-divided into .opmows files and everything else. It would also be very convenient if, when Opusmodus starts, it re-opened any .opmows files that were open when it last quit, but lacking that, having a separate section for them in Open Recent... would provide quick access to what I've been working on. As-is, any .opmows file tends to fall off the list when I open enough other files.

To reopen the last used windows you need to go to System Preferences/General panel and uncheck the "Close windows when quitting an app".

 

Wow. Thanks! I didn't realize that computer had "Closed Windows" turned on.