I have a form that has an expired certificate I need to update. I've done this on all of our forms before but on this particular one I cannot open the file in design mode. When I try to I get the same message as if I tried to double click it to open: "The form cannot be opened because either the signature is corrupt, or the certificate used to sign the form has expired or been revoked. To fix this problem, contact the form designer." I have tried opening InfoPath 2010 Designer and doing a file open but that does the same thing. Is there any way to get this to open so I can add the new cert?