Encrypt and Sign - strange problem to open on Windows

[Joseph]

I've created a simple file encrypt it with the recipient public key ONLY
and he is able to decrypt the message on Windows

However, if I encrypt the same file an addition to his key to my key and
sign it, he is not able to decrypt the message; why?

Here is how my command look to encrypt the file with his public key, my
key and signature:

gpg -v --no-batch --comment "GPG ver. 1.0.7" -e -s -u xxxxxxxxxxxx -a
--no-default-keyring --secret-keyring /home/joseph/.gnupg/secring.gpg
--keyring /home/joseph/.gnupg/pubring.gpg -r xxxxxxxxxxxxxxxx -o
/home/joseph/text.doc.pgp /home/joseph/text.doc

I'm able to decrypt this file he is not, why?

Thanks,
Joseph