The Program Files directory requires admin access to modify, and the game's installer tries to avoid asking for admin access (because that's inconvenient and insecure) - it's like when programs offer an option of "install for everyone" or "install for this user", but (for simplicity) it only supports the "install for this user" option. As far as I'm aware, %localappdata% is then where per-user installation is meant to go (on Vista / Win7).
Ok... That's nice and all... Prob is that for many win7 users that C:\Users\...\AppData\... dir is hidden and unreachable in the normal user mode... The right place to put ANY program is in the Program Files dir, and user files such as config's can be auto writen by the prog in the /appdata/. User data as mod's etc. should be written to the user's /My docs/ dir. As far as I know, that is how Win7 want's it.
Installation Directory Of The Game
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Ok... That's nice and all... Prob is that for many win7 users that C:\Users\...\AppData\... dir is hidden and unreachable in the normal user mode... The right place to put ANY program is in the Program Files dir, and user files such as config's can be auto writen by the prog in the /appdata/. User data as mod's etc. should be written to the user's /My docs/ dir. As far as I know, that is how Win7 want's it.