This isn’t really a Win7 tweak but every OS [XP, Vista, Win7] I tweak like this.
Change it to “show hidden files”
Untick the box for “hide extensions”
(and that IMHO should be default)
I’ll go one further and say that ‘Display the full path in the title bar’ should be checked as well. I hate comparing two windows named “My Documents” and not knowing which one is which.
It is the default around here. Pushed out to SBScomputers via GPP.