Here's a weird one.. opened this assembly this morning and I want to modify the flange with all the ports on it. I constructed it using a few Boolean ops. I 'edit in new window' from the top level assembly and I'm surprised to find it's listed as an imported SAT file and in a strange location. Now, I certainly didn't intend to export it as a SAT and I'm sure I didn't. I would have saved the top level assembly on which it is used as I usually do. I'm struggling to see quite how I've done this - it doesn't make any sense.