Allows the extension DLL to check if it is safe and allowed to uninstall the application. If it is not safe or allowed to do so, the extension DLL should alert the user before returning, unless performing a silent install. Calling TixMessageBox is the recommended method, because it will not display the message box in quiet mode.
- Not used
If this message is handled, pMessage->lResult must be set to one of the following result codes: