By default, a transform generated with Tuner can be applied only to the product used to generate it: this is because of the validation flags set by Tuner.
Currently, to unset this flag, you'll need to use Orca (pull down Orca's Transform menu and select Transform Properties, clearing the "Same Product Code" check box); or use MSI Automation.
For more information, see, for example, pp. 231-237 of
Administrator's Introduction to Application Repackaging and Software Deployment using Windows Installer (
www.installshield.com/ispress).