There's a lot of LML stuff that isn't in there. But I think that's by design also?
And sometimes V7.5 will load a BIN file where V8 won't. I just like having both and it's nice if the files load seamlessly.
I actually do have a workaround, but I doubt it's approved, so I'll just say it is possible to get a file opened in the old version after being saved in the Beta version.