Modifying the Registry
Registry keys can be written to the system registry once all selected components and their related files have been installed. The standard actions related to modifying the registry must be sequenced after the file installation standard actions because registry keys cannot be written unless the corresponding component and file have been successfully installed.
The RegisterProgIdInfo action manages the registration of OLE ProgId information with the operating system.
The WriteRegistryValues action processes the Registry table and writes the keys for all components that have been either installed locally or to run from source. The Registry table allows keys to be written to the HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, and HKEY_USERS registry hives.