[X4U] Double-Click App Launch .plist?

[Bill Fox]

Anybody know which preference .plist file (or other file for that  
matter) in OS X handles the mouse double-click for launching  
applications? My double-click launch quit working and it is probably  
due a corrupt .plist file. I've tried trashing and replacing:  
com.apple.desktop.plist; com.apple.driver.AppleHIDMouse.plist;  
com.apple.finder.plist; com.apple.FolderActions.plist;  
com.apple.HIToolbox.plist; com.apple.LaunchServices.plist;  and  
com.microsoft.microsoftmouse.plist--all to no avail. But if I remove  
my whole user Preference Folder from the Library folder and reboot to  
make a new default one, double-click launching works fine again.

-Bill