andrew84uk: I spotted only Vista, XP and Win 8 are supported. Has anyone had issues with The Longest Journey under Windows 7?
Regardless of what the "official" page might say, the game is in fact compatible with Win7 but it's a little iffy in places. Very likely you'll run into a crash issue when you first reach the police station. On these forums there's a post where you'll find a link to download a fix for that. I uploaded it, so look for posts by me.
If you're running an nVidia video card you will not be able to force any kind of Anti Aliasing or other modern graphics filters to improve the look of the game wtihout breaking something. You can do some tweaks if you're running an ATI card, though.
Bottom line: The game is perfectly playable from start to finish on Win7 with the exception of the one crash issue related to the police station, but there's a fix for that.