Ohkkaayyy, after months of OP working in Win 8.1 here, is now partly broken.
Since it had been stable and playable as stock OP with 2552 since August, I decided to copy over my favorite models, shiplists and music to personalize it. I had also gotten a little grief o/l about not having it someplace other than "Program Files (x86)," so I copied the entire "Taldren Software Inc" containing SFCOP to another dir ("C>Games"). When launched now, however, I just get a black screen with music playing. I tried changing the sfc.ini entry "[Mouse] async=1" to =0, but it didn't help, got the same thing. When I copied the folder back to "Program Files (x86)" though, it works just fine - I can play the stock version, I can switch to my personalized "OP15a" variant and back and is very playable. I've copied the folder back and forth between "Program Files(x86)" and other folders and the only place OP works in is "Program...(x86)." Any thoughts?