Was it maybe something like this
* Open up windows explorer
* Tools -> Folder Options.
* File Types Tab
* Select the Folder file type
* Click Advanced
* Click New
* For the Action type what ever you want the context menu to display, I used Command Prompt.
* For the Application used to perform the action use c:\windows\system32\cmd.exe (note on win2k you will want to specify the winnt directory instead of the windows directory)