If you want to un-/compress zips under bmx I suggest using the Zipengine coded by GMAN.
Download:
http://www.gprogs.com/forum/viewtopic.php?id=28 (Examples and Source included)
Forum Thread:
http://www.blitzbasic.com/Community/posts.php?topic=50074
Download:
http://www.gprogs.com/forum/viewtopic.php?id=28 (Examples and Source included)
Forum Thread:
http://www.blitzbasic.com/Community/posts.php?topic=50074