Probably a dumb question, and I think the answer will be "No", but is the default.xbe file the same for all games?
I'm struggling to get back-ups that I make (from downloaded ISO's) running, but can get other people's back-ups to work fine. If I copy a back-up from somebody else it works fine, too. I keep getting error 21 and think that it may be a problem with deault.xbe. If this is the case, could I transpose default.xbe for one (working) game to another?