Hello,
You need to manually add assemblies to tfs, then other users will be able to sync them build without problems.
To add files to tfs:
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from command line, go to the directory containing assemblies and type "tf add foo.dll"
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OR in Source Control Explorer, go to the location where the assemblies should be and click "Add to Source Control" on the toolbar or from File->Source Control
This will pend add on those assemblies, you need to check them in of course.
If those assemblies are outside of the project root, please be careful and check if the csproj file contains relative path to them and that it's the same path as on the server (should be always true if you have simple mappings).
Hope this helps