Exmoor is a program used in conjunction with More, to view XPK packed
text files.  Once installed, viewing a compressed ASCII file is as
simple as

exmoor filename

Exmoor will decompress the file if necessary, and run More to display it.
Also works fine from Workbench.  

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2222    3568  62.3% -lh5- da41 Jan  8  1998 Exmoor
[generic]                  919    1764  52.1% -lh5- 615e Jan  8  1998 Exmoor.doc
[generic]                  927    1628  56.9% -lh5- d410 Jan  8  1998 Exmoor.doc.info
[generic]                 1287    2085  61.7% -lh5- dbe9 Jan  8  1998 Exmoor.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files    5355    9045  59.2%            Jan 25  1998