Thanks, Matt.

I went to do a Windows 10 re-install, and my PC put the files on my Recording SSD. I guess it reformatted the drive. I used recovery software and recovered 771,000 files, but many are corrupted. (I haven't tried them all lol).

My .SGU files show up as .SGU files. Nothing happens when I load one. I did not have frozen tracks.

Nothing played in RealBand, either.

OH