File cap2hpux.tar.gz is a gzipped tarball.  Run this to extract files:

	cd; gunzip -c cap2hpux.tar.gz | tar xvf -

The tarball contains an executable binary for the CAPLIB2 APL
interpreter, cap2/bin/apl2, and an archive, cap2/lib/libcap2.a, with all
the object files for the CAPLIB2 subroutines.  If you'd like to
recreate the executable binary and archive from the original source,
get the Linux version of CAPLIB2.

For a brief introduction to the CAPLIB2 APL2 interpreter, see the
READ.ME file.