Rémi Bernon (@rbernon) commented about dlls/win32u/driver.c:
+}
+static LRESULT nulldrv_ModifyNotifyIcon( HWND hwnd, NOTIFYICONDATAW *data ) +{
- return -1;
+}
+static LRESULT nulldrv_DeleteNotifyIcon( HWND hwnd, UINT uID ) +{
- return -1;
+}
+static LRESULT nulldrv_SetNotifyIconVersion( HWND hwnd, UINT uID, UINT uVersion ) { return -1; }
I don't really see why you need to do that, there's already a well defined NIM enum msg that should let you dispatch the calls if you need it.