>The problem is opening the project. I have tried opening the project with fox 9 on its own as well as opening using visual promatrix 9.1.11. Both report the project slo_.pjx is corrupted.
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>So I would create a new fox project with the same name (slo_.pjx) and add in the main prg in the project manager and do a recompile all project? What about the fact that the project is already added to source control?

Yes, don't forget to backup everything before trying it. You may need to re-add the project files to the Source control if the new project will work for you.