When you go to the Tools, Options window, Environment, Add-In/Macros security, there is a listed folder like this:
The "Application Data" subfolder of %ALLUSERSPROFILE% is localized on many Windows OSs. For example, in Spanish is "Datos de programa" so it doesn't exist with that name.
Notice that other listed folder:
(which actually refers to "C:\Documents and Settings\<username>\Application Data\Microsoft\MSEnvShared\AddIns"
on Windows XP)
does it correctly and doesn't hardcode "Application Data".
NOTE: this problem happens also in VS 2005 and VS 2008.
For more info on add-in folders see: