http://bugs.winehq.org/show_bug.cgi?id=12044
--- Comment #31 from Bas Koopmans winebugs@badako.nl 2009-08-02 04:42:42 --- Same thing still happens with 1.1.25 and 1.1.26.
Garrysmod will still crash when killing NPCs with props.
And again setting the winver for garrysmod's hl2.exe to win98 somehow fixes this.