I feel a bit dumb, but I can't grasp how to extracts file from

http://plan9.bell-labs.com/sources/contrib/jas/cpython-src.arch.bz2

and

http://plan9.bell-labs.com/sources/contrib/jas/hg-src.arch.bz2


tar(1), gzip(1) and ar(1) did not helped.

How should I extract files from an .arch archive?


Giacomo