content - chm & its
update - kpd
merged:
	index - chi
	awords/kwords - chw
	search info - chq
subsets - chs
collection defn - col
window properties, bookmarks & search history - hh.dat
collections - hhcolreg.dat
Authoring:
	project - hhp
	contents - hhc
	index - hhk
	samples - hhs
	stop list file - stp
	info types - hhi