CTRL-D not working?!

[Moshe Sambol]

I downloaded GnuPG today and have started using it.  I'm able to work
with files alright but if I try to use stdin, CTRL-D is ignored by gpg!
I can't terminate the input!

I'm running on WinXP Pro, and I've tried this in a command window as
well as in a cygwin window, same results.  CTRL-D works fine for
anything else I try, like cat, etc.

------------------------------------------------------------------------
---
C:\gnupg>gpg --clearsign

You need a passphrase to unlock the secret key for
user: "Moshe Sambol <moshe at splitc.com>"
1024-bit DSA key, ID 9B16C593, created 2003-05-19

this is some sample text.
message over.
^D
^D^D^D^D
go away!^D
^D
^C

C:\gnupg>cat > test.txt
mary had a little
lamb.   <press CTRL-D here, it works.>
C:\gnupg>cat test.txt
mary had a little
lamb.

------------------------------------------------------------------------
--

I feel like something ridiculous is going on here... I've checked the
mailing list archives, no one else seems to have had this problem... any
suggestions?

Thanks.