@mikeymike
DefIcons is the better choise IMHO.
If WW documents has an extension, is very simple to setup.
If WW hasn't extension, DefIcons can recognize the filetype, from its header. (you must drag two WW files inside the DefIcons configuration tool).
The only work you'll must do, will be to erase manually ALL the original WW documents icons and create/configure 1 single def_WW.info in Env-Archive:Sys/ dir.
Ciao