Sorry then, I dont know Inno setup (I've always used NSIS), but I guess it should be as well capable of performing file writing after installation. :P

Ok here we go.

To show hidden folders in windows 7 you don't need to use the control panel. You just have to hit ALT while you are in any explore folder and a menu will pop-out. Then you will act as you do for XP and if you want you can also set it so that the menu is always visible.

On my PC the environment var %COMMONAPPDATA% seems not to exist; the one pointing to C:\ProgramData is %ALLUSERSPROFILE%.

Anyway I've found the files that you are telling me. UrlSnooper's one is the only one pointing to the correct location, the FARR and CHS are like this:
%ProgramFiles%\Clipboard Help+Spell\
%ProgramFiles%\FindAndRunRobot\

Once again I think that this is related to Win 7. As there is no easy way to change the default programs folder (C:\Program Files), every time I install something, I manually change the location to my custom one (D:\Program Files). Don't know if you can take care of this: probably those *.dcupdaterdirect filse should be dynamically generated during install time with the directory used for installation; problem is that if I change them, they get overwritten every time an update is installed (not as a top priority on your to do list as I can leave with this :P).

I really don't understand this weird logics in Windows 7; not to mention the fact (that probably you English are not acknowledge of) that localizaition of folder names is only "visual" in the explorer shell: on the file system they are in english. Every time it is nightmare to find what you are looking for...