.LBR

Library

A method of containing files, no compression. Create with NULU or LAR (various revisions) Extract with NULU or DELBR.

.?Q?

 Squeeze

Individual file compression. Create with SQUEEZE, uncompress with UNSQUEEZE. The utilities names may vary. Note: the program changes only the center character in the file extension. I.e. If the original file name is FOO.TXT, the squeezed file will be named FOO.TQT. 

 .?Z?

 Crunch

Individual file compression. Create with CR, CRUNCH (various revisions). Uncompress with UNCR, UNCRUNCH (various revisions).

 .?Y?

 LZH-CRUNCH

Individual file compression. Create with CRLZH20 and uncompression with UCRLZH20.

 .ARC

 Archive

A true archiver. Compresses and archives multiple files. Cross-platform compatible (DOS, Unix, etc.)

 .ARK

 Archive

A true archiver. The default name for ARC under CP/M

 .ZIP

 Zip

A true archiver. No utility to create under CP/M, the older versions of ZIP files can be extracted with UNZIP (various versions).

 .LZH

 LZH

A true archiver. Create with LHARC and extract with LHARD. The CP/M version cannot handle LH5 compression.

 .ARJ

 Arj

A true archiver. No utility to create under CP/M. Older versions of ARJ files can be extracted with UNARJ.

 .PMA

 PMA

A true archiver. Available only for CP/M. PMAUTOAE.COM is the self extracting file to find. This utility creates the best compression available under CP/M. It also has the ability to make self-extracting files that are archives. NOTE: has the ability to extract LH5 LZH archives create on other platforms.