2 * .lha -- Conservative Amiga user
3 * .lzx -- Progressive Amiga user
4 * .xpk -- Advanced Amiga user
6 * .zip -- Conformist who would even run Windows
7 * .dmg -- Conformist who would **not** run Windows
8 * .exe -- Idiot who thinks it's fun to create self-extracting archives
9 * .rar -- Lame pirate who tries to compress MPEG video
10 * .rar, .r00, .r01... -- Complete [[http://en.wikipedia.org/wiki/Lamer | Lamer]]
12 * .lzh -- MS-DOS or FidoNET, should probably stop playing with computers
13 * .arj -- Lame FidoNET-era user
15 * .tar.gz -- Average UNIX user
16 * .tar.bz2 -- Modern UNIX user, usually GNU/Linux
17 * .tar.Z -- Traditional UNIX die-hard
18 * .cpio -- Solaris or someone stuck with an old SVR4 UNIX
19 * .tar -- Lazy person who would waste bits disrespectfully
20 * .tar.lzma -- Compression freak
21 * .tar.xz -- Up-to-date compression freak
25 Copyright 2009 Bernie Innocenti -- it's a wiki, feel free to add your humor