Thanks for the info lardman. The fact of the matter is that this particular csound_4.24.1_arm.ipk is a tar.gz file, so all you have to do to extract it is:
\"tar xzvf csound_4.24.1_arm.ipk\" on Linux, but on Windows I think you\'d have to rename it to csound_4.24.1_arm.tar.gz.
Inside are a control.tar.gz, data.tar.gz, and debian-binary file as expected. Extracting the data.tar.gz gives:
drwxrwxr-x root/ben 0 2003-04-01 05:31:03 ./
drwxrwxr-x root/ben 0 2003-04-02 03:21:29 ./usr/
drwxr-xr-x root/ben 0 2003-04-02 03:21:52 ./usr/local/
drwxr-xr-x root/root 0 2003-04-01 10:05:19 ./usr/local/include/
drwxr-xr-x root/root 0 2003-04-01 14:36:24 ./usr/local/include/Csound/
-rw-r--r-- root/root 723 2003-02-25 22:24:01 ./usr/local/include/Csound/csdl.h
-rw-r--r-- root/root 54617 2003-02-25 22:24:01 ./usr/local/include/Csound/csound.h
-rw-r--r-- root/root 18758 2003-02-25 22:24:01 ./usr/local/include/Csound/csstruct.h
-rw-r--r-- root/root 6681 2003-02-25 22:24:01 ./usr/local/include/Csound/sysdep.h
drwxr-xr-x root/root 0 2003-04-02 03:26:02 ./usr/bin/
-r-sr-x--x root/root 5556 2003-04-01 14:35:30 ./usr/bin/csound32
-rwxr-xr-x root/root 11032 2003-04-01 14:35:32 ./usr/bin/sdif2ad
-rwxr-xr-x root/root 13360 2003-04-01 14:35:34 ./usr/bin/cs
-rwxr-xr-x root/root 6420 2003-04-01 14:35:35 ./usr/bin/csb64enc
-rwxr-xr-x root/root 9388 2003-04-01 14:35:36 ./usr/bin/makecsd
-rwxr-xr-x root/root 5004 2003-04-01 14:35:36 ./usr/bin/scot
-rwxr-xr-x root/root 4336 2003-04-01 14:35:37 ./usr/bin/scsort
-rwxr-xr-x root/root 4784 2003-04-01 14:35:37 ./usr/bin/extract
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/cvanal
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/dnoise
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/hetro
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/lpanal
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/pvanal
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/pvlook
-rwxr-xr-x root/root 4720 2003-04-01 14:35:38 ./usr/bin/sndinfo
-rwxr-xr-x root/root 7496 2003-04-01 14:35:39 ./usr/bin/envext
-rwxr-xr-x root/root 5152 2003-04-01 14:35:40 ./usr/bin/het_import
-rwxr-xr-x root/root 5260 2003-04-01 14:35:40 ./usr/bin/het_export
-rwxr-xr-x root/root 5468 2003-04-01 14:35:41 ./usr/bin/lpc_import
-rwxr-xr-x root/root 5380 2003-04-01 14:35:41 ./usr/bin/lpc_export
-rwxr-xr-x root/root 5676 2003-04-01 14:35:42 ./usr/bin/pv_import
-rwxr-xr-x root/root 5872 2003-04-01 14:35:42 ./usr/bin/pv_export
-rwxr-xr-x root/root 23188 2003-04-01 14:35:46 ./usr/bin/mixer
-rwxr-xr-x root/root 11716 2003-04-01 14:35:47 ./usr/bin/extractor
-rwxr-xr-x root/root 16804 2003-04-01 14:35:49 ./usr/bin/scale
-rwxr-xr-x root/root 22860 2003-04-01 14:35:52 ./usr/bin/srconv
lrwxrwxrwx root/root 0 2003-04-02 03:26:02 ./usr/bin/csound -> csound32
drwxr-xr-x root/root 0 2003-04-02 03:21:29 ./usr/lib/
-rwxr-xr-x root/root 1463084 2003-04-01 14:35:29 ./usr/lib/libcsound32.so
drwxr-xr-x root/root 0 2003-04-01 14:36:25 ./usr/lib/Csound/
-rwxr-xr-x root/root 54900 2003-04-01 14:36:03 ./usr/lib/Csound/stdopcod.so
-rwxr-xr-x root/root 5632 2003-04-01 14:36:03 ./usr/lib/Csound/rtlinux.so
I have installed and run this on my 5500, using the ipk I downloaded from http://www.killefiz.de/zaurus/showdetail.php?app=1114 (http://www.killefiz.de/zaurus/showdetail.php?app=1114). I would highly suggest that it is in fact a corrupt file he got ahold of.