How can the project type be modified from a class library to a WPF User control library?

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To modify a project type from a class library to a WPF User control library, follow these steps:

1. Open the solution in Visual Studio.
2. In the Solution Explorer, right-click on the class library project and select "Unload Project".
3. Once the project is unloaded, right-click on the project again and select "Edit Project File".

4. In the project file, replace the <projecttypeguids> element with the following:

   <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
   

   This will change the project type from a class library to a WPF User control library.

5. Save the project file and close it.

6. Right-click on the project again and select "Reload Project".
7. Finally, add a new User control item to the project by right-clicking on the project, selecting "Add", and then selecting "User Control (WPF)".

Your project is now a WPF User control library.