More like "wherever the Hell you keep your Steam", I never put it anywhere near the Program Files folders since those tend to randomly inflict permission issues. (Generally a good policy to avoid installing anything there you don't have to.)note, the "program files (X86)" was for only X86 system computer, for X64 you can search on "program files (X64)"
Also p sure the numbering of the folder(s) under /userdata is tied to individual accounts.