At the moment when unmapping a source on TFS Source Control in Visual Studio 2010, the local downloaded files are removed automatically.
How can I keep them untouched?
Nam.
In VS2012
"You can remove the mapping in the Manage Workspaces dialog (File -> Source Control -> Advanced -> Workspaces...) Pick your workspace and select edit, remove the entry for that mapping. Then hit OK. When prompted to perform a Get you can say "no" and the items will stay on your local disk until you next perform a Get."
I added some more information on to it.
Source: Remove Mapping
Just in case anyone else need help with this because i went for hours searching for the solution....and this is the way to see all the mappings you have and remove them if wanted without deleting local files.