Visual Studio 2008 - Make sure the application for the file type (.xaml) is installed - Quick Fix
I recently started getting the following error message when attempting to open the design view of a XAML document in VS2008:
Make sure the application for the file type (.xaml) is installed
I haven't yet been able to determine the root cause of the issue (I run SP1 of both the .NET Framework and Visual Studio itself and use this functionality every day), though there is a pretty straightforward fix. Navigate to the IDE folder of your VS2008 installation (for me: C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\) in DOS and run the following:
Reopening the development environment should result in the return of this functionality.