Visual Studio 2005 - Error opening Visual Studio solution file: Make sure the application for the project type () is installed.

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I was having trouble opening a web services solution. I kept getting the following error:

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Microsoft Visual Studio
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The application for project 'https://localhost/MyVirtualWebApp' is not installed.

Make sure the application for the project type () is installed.
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OK Help
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Took me a while to figure out what was going on, but I finally found out why I'm getting this error. It was because I didn't have the 'Visual Web Developer' component installed (option to install this is in the Visual Studio setup process). Installing that did the trick.

A similar error I believe happens for all other solution types. If you get this, check that you have the appropriate Visual Studio components installed...