Ohhh riiight. I'd forgotten that I could open a document from the menu in notepad. Not something I do often, and I almost never mess with bats.
You know, Maximus Arcade is the only fe to have Daphne squared away by only setting the exe path. (It selects all the following relevant paths automatically, etc, if they're in the same directory - which mine always are.) I had forgotten what its options were and so I got a copy and checked, and there was nothing special. It does have 'bat' as the file type - except there are no bats in any of the MA files that I found. Perhaps they're integrated? Something for MaLa - well, any fe - to shoot for.