According to the wine appdb, the games appear to work fine apart from loading or saving. The results are old, though, and no bug seems to have been filed about it.

If someone here is in the position of trying out whether this is still an issue with recent versions of wine and the GOG.com versions of the games, I would like to know before the offer expires on Thursday.

I'm using Xubuntu 13.04 with Wine 1.7.1 and just installed episode 1 (non-GOG). The loading/saving issue is still there which is disappointing since it's playing a lot better than when I installed it on Vista.

Too bad :(
Thank you for the information, though.

i'm on manjaro 0.8.7.1 with wine 1.7.2. when i finally get the key for the gog season pass i will test it and tell you the results.

Actually it seems to be the bug in the Unity engine - it's not that obvious but the engine expects to see a directory AppData\LocalLow in the user profile and fails to create it (maybe it's there in recent WIndows versions but, well, last version I used extensively were Win2k and I don't remember it there and Wine does not create it either).

The fix is trivial: in your WINEPREFIX create drive_c/users/YOURUSERNAME/AppData/LocalLow/ (do not forget to replace YOURUSERNAME with the actual login).

Same fix works for, eg, Larry Reloaded - a FAQ maybe?

PS Played through Episode 1 with wine 1.6 plus this fix, everything seems to work except that the game is incredibly slow at times, usually while plotting path for the character to walk (still quite playable, and re-starting the game seems to fix this to some extent). Episode 2 works even a bit better - no slow path calculations at least.

UPDATE: Played through the whole 4 episodes, no major problems, just a minor graphics glitches - sometimes the character is painted on top of the objects in front of her, probably engine's fault, and sometimes the shadows are flickering like mad - a bit less with "Fastest" graphics setting. Wine 1.6, GeForce GT640, Slackware 13.37.