Tree Differences + Compare to Local Directory + Message: "There is no working folder mappin

I would like to compare folder of TFS project ($/Proj1/Dir1/Dir2) to local folder with the same structure of files for example to:C:\proj1\Dir1\Dir2(this folder in not connected with TFS).
When I selectCompare... item from context menu ofSource Control Explorer,choose Compare to folder (Local path...) and press OK button i get message: "There is no working folder mapping for: C:\proj1\Dir1\Dir2".

My question: is it posibble to compre TFS folder to local folder likes that?

Thanks for help.
Michal

[728 byte] By [MichalIVO] at [2008-2-6]