Add a project to a VS2008 solution, without the project going into Perforce

I know this is possible because one of my older solution files has a mix of some projects under source control and some not.

However I can't seem to reproduce that configuration with a newer solution. Every time I add a project to the solution it acquires a yellow cross and under Pending Checkins the project is listed as a Newly added file.

This is with the Perforce plugin for VS2008.

I have tried adding a brand new project, vs an existing project. I have tried p4 obliterate. I have tried disconnecting and reconnecting source control. Binding and unbinding.

After all this, every time I try and add the project it gets a pesky little yellow cross. I can't seem to tell Perforce and VS that, while I do want source control on the majority of the solution, I don't want this one project file under source control.

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