When one needs to extract CAB files, the perfect tool is Cabextract, as it is able to extract a wide variety of CAB formats reliably and is simple to use, being command-line driven and scriptable

The DOS binaries for Cabextract can be located on iBiblio at:

http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/util/user/cabextx.zip 

The modified source code of Cabextract for DJGPP can be also found on iBiblio with the following address:

http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/util/user/cabexts.zip 

and the original homepage for Cabextract is http://www.kyz.uklinux.net/cabextract.php.