A cross platform utility to split and join files... and it works ;)
Binary versions included:

Amiga WB2.0 +
Amiga WB1.2, WB1.3
MSDOS

Plus source code and makefile for compilation on a Unix box.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
drwx------   369/55          0       0 ****** -lhd- 0000 Apr 18  1996 chunker/
-rw-------   369/55       2887    4432  65.1% -lh5- 1152 Apr 18  1996 chunker/chunker
-rw-------   369/55       4767   11132  42.8% -lh5- cc80 Apr 18  1996 chunker/chunker.doc
-rw-------   369/55        269     850  31.6% -lh5- e031 Apr 18  1996 chunker/chunker.doc.info
-rw-r--r--   369/55       8192   13421  61.0% -lh5- c97b Apr 18  1996 chunker/chunker.exe
-rw-------   369/55        254     359  70.8% -lh5- 514b Apr 18  1996 chunker/chunker.readme
-rw-------   369/55       6164    9780  63.0% -lh5- 7079 Apr 18  1996 chunker/chunker13
-rw-------   369/55       2819    4308  65.4% -lh5- b5b5 Apr 18  1996 chunker/dechunk
-rw-r--r--   369/55       8104   13261  61.1% -lh5- 47fc Apr 18  1996 chunker/dechunk.exe
-rw-------   369/55       6121    9680  63.2% -lh5- eedb Apr 18  1996 chunker/dechunk13
drwx------   369/55          0       0 ****** -lhd- 0000 Apr 18  1996 chunker/source/
-rw-------   369/55        117     150  78.0% -lh5- 79c5 Feb 18  1996 chunker/source/SCOPTIONS
-rw-------   369/55        141     213  66.2% -lh5- 55af Feb 18  1996 chunker/source/Source.txt
-rw-------   369/55        475    1011  47.0% -lh5- e8e6 Apr 18  1996 chunker/source/bfn.c
-rw-------   369/55        201     390  51.5% -lh5- 88dd Apr  1  1996 chunker/source/bfn.h
-rw-------   369/55        582    1479  39.4% -lh5- 792f Apr 18  1996 chunker/source/chunker.c
-rw-------   369/55        212     390  54.4% -lh5- 9d8d Apr  1  1996 chunker/source/chunker.h
-rw-r--r--   369/55       1269    5523  23.0% -lh5- ec79 Apr 18  1996 chunker/source/chunker.prj
-rw-------   369/55        477    1065  44.8% -lh5- 9f8e Apr 18  1996 chunker/source/dechunk.c
-rw-------   369/55        210     373  56.3% -lh5- ac44 Apr  1  1996 chunker/source/dechunk.h
-rw-r--r--   369/55       1233    5523  22.3% -lh5- 92b8 Apr 18  1996 chunker/source/dechunk.prj
-rw-------   369/55       1262    4289  29.4% -lh5- e596 Apr 18  1996 chunker/source/machine.c
-rw-------   369/55       1154    3173  36.4% -lh5- 2b6b Apr 17  1996 chunker/source/machine.h
-rw-------   369/55        439     945  46.5% -lh5- 24ba Apr 18  1996 chunker/source/makedist
-rw-------   369/55        314     813  38.6% -lh5- ef8d Apr 17  1996 chunker/source/makefile
-rw-------   369/55        346    1139  30.4% -lh5- c978 Feb 20  1996 chunker/source/smakefile
-rw-------   369/55        174     343  50.7% -lh5- 9b4d Apr 17  1996 chunker/source/version.h
-rw-------   369/55        270     628  43.0% -lh5- 62f1 Nov  5  1995 chunker.info
-rw-------   369/55        143     171  83.6% -lh5- d319 Apr 18  1996 file_id.diz
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        29 files   48596   94841  51.2%            Apr 25  1996