I have several user control files that when I double click them will open up into code view. In fact, design view is not even available for them (the icon in the solution explorer is the class icon instead of the user control icon). All of the other user controls work just fine. I can even create a new user control, copy ALL of the code from the bad user control into it, and it opens in design view just fine.

Here is the question... how does Visual Studio keep track of whether or not a file can be opened in design view? Is there a way to clear this? My issue can't be with code because I have two files with absolutely identical code but one does not have the option to open it in the forms designer and the other one does.

This is in Visual Studio 2003 Enterprise Edition.