As far as I know, Team Foundation Server 2010\'s source control (and prior versions) doesn\'t support linking (Symbolic links) of files.
Linking (per Visual SourceSafe)
It's not possible to make classical links, but it's possible to use branches for simmilar functionality. You can use a branch over folder to make something simmilar as were links. The only drawback is that you still work with branches, so it's necessary to do merges etc. See section "Source Code Sharing" of this document for detailed instructions.