Plz, have a look into this thread too: http://eab.abime.net/showthread.php?t=72785
On my WinUAE 68000 system the WBStartup/DefIcons commodity from the NewIcons package works with WB 3.1 (no Guru). But with WB 45.127 it doesn't load the deficons anymore.
Ok, I will check out if it's possible to patch envhandler. I've never tried it.