Program Files is a protected folder, in that you need admin access to write there. c:\users\[username]\ is where (according to MS and their publishing partners) program data that's downloaded or created should go. I get that it's not the renpy way, but by and large that's how every non-renpy game does itI usually install games to my games drives, or in the case of games like this, my porn drives. The funny part of that is that the ones you are talking about always put them in protected system folders, like my docs, my games, or app data, which are even a hidden folders sometimes. Never had a problem with things in Program Files folders before, but I am not a coder.