wow MINT you saved my day =), when I opened the autoback folder it only showed .max files, and you said there's a .bak file
so I went looking and there it was, in all it's glory =)
I really appreciate this guys
in any case if someone DOES know how to fix this corrupted files, I think it would be invaluable to all of us

im so happy
//edit: still can't save, it corrupts the file
could this be due to the fact there are Xrefed objects in the scene?
if so, what am I gonna do abotu the animation???