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.

Action scheduling

This message is sent by the StartProcessing standard action if the current run mode (TsuRunMode variable) indicates a full uninstallation.


Not used

Result code

If this message is handled, pMessage->lResult must be set to one of the following result codes: