I have tried to load it with both Daemon Tools and Virtual Clone Drive (latest versions) - neither work.
The file shows as the 26gb file it should be, but it will not load. I loaded it into ISObuster and got some weird error about lost something or other. I'll look again. But this was created with the latest version of IMGburn... why would it give an error like that? ISObuster scanned thru it and found files that are the correct size (20+gb) but they are NOT in the file structure of a blu ray movie. But they are MT2S files and so on.
Maybe I'll try extracting it, renaming it, and see if that plays as a movie? Otherwise I'll have to rip the disk again...
EDIT: opened the file again and it said there was lost data, and if I wanted to try and recover it. Doing that now...