Buy at Frictional Games and download from Steam

[MooseTheScared]

I think Valve is perfectly content to have their games and steam run under WINE instead of officially porting/supporting it.

That's true. I saw somewhere on the Steam site that they are not going to release Linux version in the near future. But it's not a problem since Steam works perfectly in Wine. Of course, in Amnesia case it is more sensible to run native Linux version.