Charlie,
If you have BIAB open and then double-click on the file, does the file open in BIAB?
Regards,
Noel
No. A second session of BIAB opens but it doesn't open the SGU file. I have two blank BIAB sessions.
I have MGU and SGU files associated with 32 bit so it doesn't recognize if the 64 bit version is open either.
I have both versions set to run as Administrator and running the very latest update.