I've nearly completed developing a game for Windows and I'm curious where I should have the installer install it. I know it used to be in "Program Files" but has that changed under Vista?
I know that World of Warcraft now installs under Users/Public/Games... what is the Microsoft-recommended location for games?
You should use the Environment variables.
Namely %PROGRAMFILES% for you.
Just read the question a little more thoroughly. From my experience of Vista, most of the gubbins still install to %PROGRAMFILES%. Perhaps the /users/public... path is somewhere where things can install (and update) without having to get admin perms all the time. (A complete guess)
Looks like you should use SHGetKnownFolderPath to ask for the location of the FOLDERID_Games KNOWNFOLDERID.
EDIT: Nope, doesn't look like that is right. This thread has a discussion of FOLDERID_Games and notes that it is a virtual directory. This knowledgebase article discusses the Windows Vista Games Explorer. And this article has some more Vista specific information.
Sorry - this has turned into a non-answer but maybe the links will help you find the answer.
In Vista, the recommended directory is still %PROGRAMFILES%.
Note that in Windows 7, Microsoft has enabled the creation of true per-user installations, including support for per-user Program Files. This is a feature of Windows Installer 5.0, and you can read more about it here:
http://msdn.microsoft.com/en-us/library/dd408068(VS.85).aspx
The recommended directory is still Program Files, as everyone has said. However, if you want a per-user install, you could install it in the AppData folder. I know Google Chrome does this to allow installation without being an administrator, and also for user-specific installation.