The file swkitdos.exe contaisn this file and 4 others.

aspidac.sys	Provides ASPI support for Tape and CDROM
btcdrom.sys	Provides support for CDROM drive on controllers running
		firmware version 3.52 or later.
dacdrvr.sys	DOS protected mode driver, not required for controllers
		running 3.52 and later, or 4.06 and later.
daccda.sys	Provides CDROM for controllers running firmware 5.1 or
		earlier.