In Windows 7/Vista a user can open his/her application data folder by running the command ‘appdata’ from Run window.

This command opens up the container folder where the local appdata folder and roaming appdata folder are stored. To open local appdata folder you need to run %localappdata% from Run window. To open roaming appdata folder we can use %appdata% command.
In Windows XP, you need to run the command %appdata% in run window to open appdata folder. There are no separate folders for local and romaing data in XP.
{ 2 comments… read them below or add one }
This doesn't work (XP Home) – it should be:
%appdata%
Thanks for the comment. The post is updated with the right commands for XP and Windows 7.