For me, these were Visual Studio 2008 management teams.
EDIT . I also had this problem with other other free extensions. I just can't remember which one was different :(
EDIT2 : I just remembered, I installed SilverLight Tools 2 or 2 beta. This caused this problem. It also messed up DataAnnotations with an older version and messed up the Entity Framework for me. The reinstallation of my car is over.
mhenrixon
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