* .lzh -- Old MS-DOS or FidoNET user, should probably stop playing with computers
 
 * .lha -- Conservative Amiga user
 * .lzx -- Progressive Amiga user
 * .xpk -- Advanced Amiga user

 * .tar.gz -- Average UNIX user
 * .tar.bz2 -- Modern UNIX user, usually GNU/Linux
 * .tar.Z -- Old fashioned UNIX die-hard.
 * .cpio -- Solaris or someone stuck with an old SVR4 UNIX
 * .tar -- Lazy people who would waste bits disrespectfully