wont that just open up a new folder?, i know im being petty, but i have all gog games in Program Files (x86)\GOG.com folder
No, it definitely won't (we checked what happens), because it's the same as if you would put just C:\Program Files(x86). Then, if you decide to uninstall everything, the uninstaller will delete install directory (which is C:\Program Files(x86) ), and that won't go very well.
To address this issue:
-There are many games that have problems with installation in Program Files, due to Windows handling of permission for these folders.
-And there are lots of games that can't handle a directory with a dot - this is why it was blocked in the new installer by default.
This is why we applied limitations to the installation directory. But since this is apparently a bigger problem for users than I expected, we can remove them in the future installers.