Indicates the start of an InstallMate session. Clients should use this opportunity to perform any global initialization and, if necessary, use pMessage->lCookie to let InstallMate maintain additional state between messages. pMessage->dwSessionType indicates the type of session that is about to start. Any associated cleanup should be performed during TIXMSG_TERMINATE.
This message is sent as soon as the extension DLL is loaded and before the UI is created. Therefore, your handler should not rely on the availability of a main window and in fact should not display any message boxes, dialogs, or windows at all.
This message is also sent during preflight checks when InstallMate builds the installer.
- Not used
If this message is handled, pMessage->lResult must be set to one of the following result codes: