dlls/appwiz.cpl/addons.c #define MONO_VERSION "4.7.1" #define MONO_SHA "2c8d5db7f833c3413b2519991f5af1f433d59a927564ec6f38a3f1f8b2c629aa" it verifies a SHA2 signature that is hardcoded in the source. It downloads it via http://source.winehq.org/winemono.php