wuapi: Add UpdateInstaller coclass.

dlls/wuapi/main.c

@@ -111,6 +111,7 @@ static const struct IClassFactoryVtbl wucf_vtbl =
 static wucf sessioncf = { { &wucf_vtbl }, UpdateSession_create };
 static wucf updatescf = { { &wucf_vtbl }, AutomaticUpdates_create };
 static wucf sysinfocf = { { &wucf_vtbl }, SystemInformation_create };
+static wucf installercf = { { &wucf_vtbl }, UpdateInstaller_create };
 
 static HINSTANCE instance;
 
@@ -146,6 +147,10 @@ HRESULT WINAPI DllGetClassObject( REFCLSID rclsid, REFIID iid, LPVOID *ppv )
     {
        cf = &sysinfocf.IClassFactory_iface;
     }
+    else if (IsEqualGUID( rclsid, &CLSID_UpdateInstaller ))
+    {
+       cf = &installercf.IClassFactory_iface;
+    }
     if (!cf) return CLASS_E_CLASSNOTAVAILABLE;
     return IClassFactory_QueryInterface( cf, iid, ppv );
 }

include/wuapi.idl

@@ -1330,6 +1330,15 @@ interface ISystemInformation : IDispatch
 coclass AutomaticUpdates { interface IAutomaticUpdates; }
 
 [
+    helpstring("UpdateInstaller Class"),
+    threading(both),
+    progid("Microsoft.Update.Installer.1"),
+    vi_progid("Microsoft.Update.Installer"),
+    uuid(d2e0fe7f-d23e-48e1-93c0-6fa8cc346474)
+]
+coclass UpdateInstaller { interface IUpdateInstaller; }
+
+[
     helpstring("UpdateSession Class"),
     threading(both),
     progid("Microsoft.Update.Session.1"),