timppu: That means GOG should be selling games on the original physical floppy discs and CD-ROMs, not images made out of them? Otherwise it is not preservation?
I don't think they need to go that far. Enough people have observed though that one-man Abandonware outfits also wrap games with DOSBox / ScummVM, but unlike GOG they don't go randomly deleting half the .exe's, then don't charge money for that, then it's an uphill struggle to point to the half-missing GOG versions and say
"See that? That's the best preserved version of the game, that is..." The gripe I have with this stuff is as follows : 25 years ago neither DOSBox nor ScummVM existed nor was there a need for them to under Win 9x OS's. Then 64-bit CPU's & XP_64 came out and people realised 16-bit games would soon be natively unplayable under 64-bit OS's, so emulators / source ports started to become a thing. No-one in the 90's saw that at the time though (
"Why on Earth would you you need to do that, it runs fine natively today"). In 10, 20, etc, years time, we could be in a similar unforeseen situation where a new ScummVM-like piece of software may be needed for future Windows or even x86 as a whole, but unlike the ScummVM of today, perhaps it will require the original .exe's to be present. And then "preserved" GOG versions of certain games will be the only ones that will stop working, whilst "others" (40 year old discs, "Abandonware", etc) still will.
The real takeaway point is this - real-world "Game Preservation" is about keeping game files intact not for the 'knowns of today' (
"but, but but, GOG is all about getting games to run on today's systems (tm)"...), but also the 'unknowns of tomorrow' (none of us know where Windows / x86 will be in 20 years time, so keep the game intact anyway just in case). Same goes for a lot of compatibility tweaks - there are mods, tweaks, etc, that get broken when trying to install them over the top of older ones and a future better tweak or perhaps a full source port vs a patch may well need to see the original games files, not just bits of some "pre-modded" ones or a pre-altered .exe that can't be unpatched 20 years down the line.