Plavozont: Whats the difference(in bytes)(except for bonuses) between original games and games from GOG.COM?
Hopefully? Not much. We will tweak drivers, configure things differently, but we're doing our best to preserve the classic game experience, updated to run on modern Windows operating systems.
If you have your own original executables, many of the games that we sell don't do much that you couldn't do yourself if you had the know-how. We provide ease of use and--for some games--specialist knowledge that you probably don't have to get them working. ;)
bazilisek: All sorts of workarounds, really. Various wrappers. ScummVM and DosBox are a godsend for GOG. Sometimes even old cracks and fan patches. It very much depends on the game in question.
And, occasionally, black magic.