This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
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) ---------------------------- By: 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. ---------------------------- By: Tony Ward I also prefer File-A-Trix. It performs a wide variety of functions including copy, move, delete, rename, catalog, make new folder, set file attributes (lock, unlock, filetype, auxtype), find file, format (floppy only), view text, Teach and AWP files. Best of all, it's a CDA that works from GS/OS and ProDOS 8, although there are some restrictions under P8 (ie. no HFS disk access, no viewing forked Teach files, etc.) ---------------------------- By: Gareth Jones I use either File-A-Trix, Change-A-File 4.20, or Deliverance (part of the Salvation Utilities). ---------------------------- By: Rubywand Some programs which can be used to change filetype are ... Jeff Hartkoph's File Manager- a GS NDA which lets you change Type, Auxtype, Date, and Access attributes. It is handy for modifying several files in quick succession. Paul Parkhurst's PMPunZip- a GS application which includes an option for changing Type, Auxtype, and Access attributes. (In the File menu click on Modify File Attributes.) Glen Bredon's ProSel (ProDOS 8 utilities) Roger Wagner's Filetype Changer- a vintage BASIC utility which lets you change just the Type. A BRUN-able .BIN version is on Ground. (This is good enough for getting the GS-ShrinkIt .SEA file's filetype set correctly so that it can self- extract.) ---------------------------- By: Beverly Cadieux And a biggie - AppleWorks v5.1-> File Activities, Change File Type. ---------------------------- By: Jay Edwards TimeOut FileMaster does a great job and never argues about it. Best of all, it likes so many versions of AppleWorks. By: Rubywand
 
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