Unpacks Sinclair QL .CPT files, created with the CPT tool written in 1989 by
Sander Plomp. This is not the Apple Macintosh "Compact" or "Compact Pro" format
by Bill Goodman. The original CPT and UNCPT tools came with the instructions
found here: http://www.kyz.uklinux.net/downloads/uncpt.txt You can find some
CPT-encoded files here; http://m.m.nu/orig-filedates/ql_files/  Sander also
wrote an archiver called QARC, but I have not yet looked at that. For a start, I
cannot find and QARC encoded files.