Where could I find more information about the Installer?

More specifically, I want to know if I can use it to copy files from
the Mac HFS partition to the NetBSD partition. For example, I have
Xmac68k_color.tar.gz sitting on my HFS partition - can I use the
Installer to lob it over the wall to NetBSD? If so, how do I control
what directory it lands in? What about files that aren't tarred or
zipped?

Thanks

Ian