Not able to add a BizTalk Project in Visual Studio 2008

It's possible that you're not able to add a biztalk project in your visual studio 2008.
The likely cause is a new visual studio 2008 installation, or it's updated in any way.

The solution to this problem is quite simple.You could just do a repair of your BizTalk with the setup, this should do the trick.

Or another way to accomplish this is by changing the registry key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Projects\{FAE04EC0-301F-11d3-BF4B-00C04F79EFBC}] from ‘csproj’ to ‘csproj;btproj’.
For a 64 bit version of visual studio this would be as follows:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\9.0\Projects\{FAE04EC0-301F-11d3-BF4B-00C04F79EFBC}
Somehow this key gets reset every time the Visual Studio installation is changed...

RESOURCES:
http://ronaldlokers.blogspot.com/2010/12/visual-studio-2008-doesnt-know-biztalk.html
http://blogs.msdn.com/b/biztalkcrt/archive/2009/08/21/visual-studio-2008-fails-to-create-open-biztalk-projects.aspx