help using netpgpverify anyone?

[Henry]

There was a post recently which introduced NetPGP.  Is there
someone who has used it successfully to verify the signiture
on a binary file?  I could use help on how to form a working
command line.

I tried `netpgpverify -k ~/.gnupg/pubring.gpg gnupg-1.4.22.tar.bz2.sig`
in a directory containing gnupg-1.4.22.tar.bz2, but I get the output:
Ignoring unusual/reserved signature subpacket 33
[above line repeated 12 times]
weird type of sig! 16
read_sigpkt: can't read sigs v3
can't read keyring

I've tried many other possible command lines, but no luck so far.

TIA for any help.