Writing a Co-installer
Features described in this section are not supported and driver packages containing them will no longer receive a Microsoft signature. See Using a Universal INF File.
A co-installer is a Microsoft Win32 DLL that assists in device installation. Co-installers are called by SetupAPI as "helpers" for Class Installers. For example, a vendor can provide a co-installer to write device-specific information to the registry that cannot be handled by the INF file.
This section includes the following topics:
Submit and view feedback for