Just letting you all know - I've noticed zeldaclassic.com has several file types mentioned under "Resources":

.zmod
.qst
.ztheme
.ztile
.ztileset
.zcombo
.zalias
.znpc
.zitem
.zwpnspr
.zdmap
.zasm

But many of these links return "This search returned no results"

I've seen many .qst and .ztheme files, but I'm interested in the specifications of the rest as I haven't found any examples.