/Vista Dualbooting and shared "game folder"

[2ndpink1ndstink]

I have a dual boot setup with Win 7 64bit and Windows Vista 32bit, with both in separate partitions. My original bf2 and pr was installed in Vista and I successfully updated the registries in Win7 to run BF2 or PR on the Vista partition instead of reinstalling the whole thing--Some people call this "shared installation". Also I have redirected My documents folder so it uses my Vista's one and I checked the profiles and it loaded correctly (it used to be a problem before).

I'm currently installing PR on windows 7 (which actually installs it on the vista partition) and am curios if there's a registry entry just for PR or anything special I should know, so when i play PR on vista it would all work the same.

Confusing ain't it? Hopefully this will guide dualbooters like me and save them some few gigs in their HDD.