Contents of the "proginfo" subdirectory for UnZip 5.42 and later:
Contents this file
CONTRIBS list of contributors to UnZip
ZipPorts Info-ZIP rules and guidelines on contributions to the cause
3rdparty.bug known bugs in PK[UN]ZIP, WinZip, etc.
defer.in info about the NEXTBYTE macro and defer/undefer_input functions
extrafld.txt info about all known "extra field" types
fileinfo.cms info about the VM/CMS file system, including record formats
nt.sd info about support for Windows NT's Security Descriptors (ACLs)
perform.dos relative performance of Zip and UnZip with various DOS compilers
timezone.txt explanation of the TZ environment variable for timezones
ziplimit.txt limits of the Zip archive format and InfoZip's implementation