Lion: Switching an Application's launch preference off of Rosetta (PPC)

I have a case where a machine was upgraded to Lion. Prior to Lion the user was running Photoshop CS4 (a Universal Binary) under Rosetta which required hitting a checkbox in the application's "Get Info" dialog. With the advent of Lion and the removal of Rosetta, the checkbox is gone but the OS still tries to run Photoshop as a PPC binary and fails. Is there a way I can reset the "Launch this UB as a PPC binary" flag?