Format                          |Filename
                                |Suffix
                                |      |[C]reates and
                                |      |Unpacks, or
                                |      |[U]npacks Only
                                |      |   |
                                |      |   |Computer(s) Which
                                |      |   |Use This Format
--------------------------------|------|---|--------------------------
NuFX . . . . . . . . . . . . . .| .SHK | C | Apple II
NuFX in Binary II . . . . . . . | .BXY | C | Apple II
Binary II . . . . . . . . . . . | .BNY | U | Apple II
Binary II in Binary II. . . . . | .BNY | U | Apple II
ACU (Used on America Online) . .| .ACU | U | Apple II
ACU in Binary II . . . . . . . .|  --  | U | Apple II
ALU in TEXT .(filetypes) . . . .|  --  | U | Apple II
SQ (BLU) . . . . . . . . . . .  | .QQ  | U | Apple II
SQ in Binary II (BLU) . . . . . | .BQY | U | Apple II
AppleSingle . . . . . . . . . . |  --  | C | Apple II
AppleSingle in Binary II . . .  |  --  | U | Apple II
StuffIt . . . . . . . . . . . . | .SIT | U | Macintosh
StuffIt in MacBinary I or II. . | .SIT | U | Macintosh
StuffIt from America Online . . | .SIT | U | Macintosh
Zoo . . . . . . . . . . . . . . | .ZOO | U | IBM PC, Amiga, Atari ST,
                                |      |   | Unix systems
ARC . . . . . . . . . . . . . . | .ARC | U | IBM PC, Amiga, Atari ST
Compress . . . . . . . . . . .  | .Z   | U | Unix Systems


see also:
http://fileformats.archiveteam.org/wiki/Squeeze
http://fileformats.archiveteam.org/wiki/LBR
http://www.seasip.info/Cpm/ludef5.html