http://blogs.msdn.com/jianges/archive/2008/03/28/tfs-sdk-will-cause-invalidprogramexception-while-running-as-64-bit.aspxIssue: ===== You create a C# project that uses TFS SDK. But it crashes when you try to run it on a X64 bit OS machine: Unhandled Exception: System.InvalidProgramException: Common Language Runtime detected an invalid program. at Microsoft.TeamFoundation.Client.TeamFoundationServerFactory.GetServer(Stringen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/jianges/archive/2008/03/28/tfs-sdk-will-cause-invalidprogramexception-while-running-as-64-bit.aspx#8410468Sun, 20 Apr 2008 00:56:48 GMT91d46819-8472-40ad-a661-2c78acb4018c:8410468Discount Airline Tickets &raquo; TFS SDK will cause InvalidProgramException while running as 64 bit<p>PingBack from <a rel="nofollow" target="_new" href="http://www.travel-hilarity.com/travel-airline-tickets/?p=201">http://www.travel-hilarity.com/travel-airline-tickets/?p=201</a></p>