If you've ever dealt with a "Project Type Unknown" you'll love this list, Visual Studio Project Type GUIDs

CodeProject - List of Visual Studio Project Type GUIDs

Background

Knowing these GUIDs will allow you to edit .csproj files to easily change a project type in cases where Visual Studio will not allow using the GUI

With what I blog about in the different areas, new VS versions, etc, I run into this, "Project Type Unknown" all the time. Then I search with the GUID and try to figure out what the actual project type was. In short, I've needed this list for about forever. If you've every had to deal with this too, you'll know the value of this list...