the default cooking winetricks is not executable when installed and uses some wget options unknown to busybox, so the real wget should be a dependencie. this could be the correct receipt

# SliTaz package receipt.

PACKAGE="winetricks"
VERSION="20101008"
CATEGORY="misc"
SHORT_DESC="Script to install various redistributable runtime libraries in Wine."
MAINTAINER="slaxemulator@gmail.com"
DEPENDS="wine cabextract unzip zenity wget"
WEB_SITE="http://wiki.winehq.org/winetricks"

# Rules to gen a SliTaz package suitable for Tazpkg.
genpkg_rules()
{
	[ -f $SOURCES_REPOSITORY/$PACKAGE-$VERSION ] ||
	wget http://www.kegel.com/wine/$PACKAGE -O $SOURCES_REPOSITORY/$PACKAGE-$VERSION

	mkdir -p $fs/usr/bin
	cp -a $SOURCES_REPOSITORY/$PACKAGE-$VERSION $fs/usr/bin/$PACKAGE
	chmod a+x $fs/usr/bin/$PACKAGE
}

in my system it works