To unload and edit a project file in Visual Studio
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In Solution Explorer, right-click the project and click Unload Project. The project is marked (unavailable).
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In Solution Explorer, right-click the unavailable project and click Edit <Project File>.
The project file opens in the Visual Studio XML Editor.
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Edit, save, and close the project file.
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In Solution Explorer, right-click the unavailable project and click Reload Project.
