User`s guide

If you download a GZ file directly to your Apple you can use a program
named "GZPK" v2 to convert it from gzip form to a zip format which can be
unzipped via PMPUnzip 2.0 or Angel. A GZ file from the Asimov site should end up
as a DSK file.
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From: lachlan_arnott and Byron Desnoyers Winmill
On a Mac, you can use MacGzip to unZIP g-zipped (.gz) DSK files into
uncompressed form. Another choice (for doing the same job as WinZIP on a PC) is
Aladdin's StuffIt Expander and the DropStuff Expander Pack. These utilities can
be found on many Macintosh related ftp sites. (See Q&A 007.)
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From: Slick
009- Which programs can change ProDOS filetype?
I prefer More Info or Disk Witch, myself. I'll go through a list of stuff
on my hard drive to manipulate filetypes:
DAs:
Alter (NDA)
Conchshell (CDA)
Disk Witch (CDA)
File Manager (NDA)
File Info2 (NDA)
File Info Edit (NDA)
Super Info II (NDA)
Utilities CDA (CDA), not very good
Finder Extras:
More Info
GS/OS Applications
Instant Access
File Passage
ProDOS 8
FAZ II (File Attribute Zap II)
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From: Boris Guenter
File-A-Trix by Karl Bunker should do the job. Best of all, the latest (and last)
version 1.1.1 of this program is freeware.
Since I had a few troubles with the latest version, I suggest trying both
versions 1.1 and 1.1.1.
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From: Tony Ward