"--armor" ignored when using the "--set-filename" option?

[Ralf Hauser]

Thanks to Brian,
(http://lists.gnupg.org/pipermail/gnupg-users/2004-January/021198.html) I
figured that the attachment name can be hidden with GPG.

However, I have troubles now getting "set-filename" to work together "armor"
(input and output are piped):

1) <<gpg --homedir
/tmp/gpg-jw-ewynt6dazpf4 --no-tty --always-trust --comment
yComment  -a  --set-filename a.txt --sign --passphrase-fd 0 --encrypt -r
87826F38 >> the armor command gets ignored and binary output is produced (I
am running this out of Java and get java.io.IOException: Broken pipe)

Changing to "--armor" has no effect.

2) I tried all kinds of other variants breaking the sequence of "gpg
[--homedir name]  [options]  command " (as per the man page) that all
produced
 <<usage: gpg [options] [filename]>>
e.g. put the set-filename to the end
(because on the command line "gpg --armor --encrypt --recipient
me at domain.com --set-filename foo.txt <inputFile >encryptedFile.asc") works,
...

Any hints would be highly appreciated!

   Rgds Ralf

P.S.: setting "--debug-all" didn't appear to provide further insights either
(no output in case 1), the below in case 2) ):
gpg: NOTE: no default option file `/tmp/gpg-jw-d9hmzoxay6qs/options'
usage: gpg [options] [filename]
random usage: poolsize=600 mixed=0 polls=0/0 added=0/0
              outmix=0 getlvl1=0/0 getlvl2=0/0
secmem usage: 0/0 bytes in 0/0 blocks of pool 0/16384