Customer has developed an application and has deployed to various devices. The application installs/runs fine on the following devices... MC75 - WM 6.1 PRO MC3190 - WM6.5 CLASSIC However, the application will not run on the following devices... MC3090 - WM6.1 CLASSIC (40x units throw this error) MC9090 - WM6.1 CLASSIC (60x units throw this error) The error the customer receives is as follows (I also attached a screenshot) "The file cannot be opened.  Either it is not signed with a trusted certificate, or one of its components cannot be found.  If the problem persists, try reinstalling or restoring this file." Does anyone have any tips as to what the customer can try to do to get their application to run on the problem devices?