Why would my Visual Studio 2008 close everytime I open a .xaml file?

Question

Visual Studio 2008 has been very stable for months on my computer.

This morning when I double-click on any .xaml file to open it, or even click on the tab of an already opened .xaml file, Visual Studio says "initializing toolbar" in the status bar and then 20 seconds later fully closes the whole application without any error message.

Other files (e.g. .cs class files) I can open fine.

Has anyone experience this or know what I could check/change to be able to use Visual Studio to edit .xaml files again?

MORE INFO: I can also create a new project and create and edit .xaml files fine.

MORE INFO: I can edit .xaml files in other modules (projects) fine.

MORE INFO: Everytime it crashes, this event is registered:

.NET Runtime version 2.0.50727.3053 - Fatal Error in executable module (72555E00) (80131506).

(odd since I have .NET framework 3.5 installed)

MORE INFO: It is only in one module (project) that .xaml files cause Visual Studio to crash. Even creating a new UserControl in that module crashes Visual Studio.

Answer 1

I get this occasionally (with .xaml and .resx files) and find that if I delete the solutions .suo file things work fine again.

[The suo file just contains per user settings like recently opened files etc so it's nothing important and will just be recreated when you next open the solution.]