CHMOD on filesnames with spaces

CHMOD on filenames with spaces does not seem to work;

SITE CHMOD 646 20 - AudioTrack 20..ram
500-'SITE CHMOD 646 20 - AudioTrack 20..ram' not understood.
500 SITE not understood.

i've tried a simple other client(coreftp) and adding double quotes for files with a space should solve this issue.

-edit and now i've done a custom command in smartftp for this:
SITE CHMOD 646 "%ff"
and this works. but it would be better if this would work from the chmod menu

The SITE CHMOD command shouldn't require quotes around the filename.
What server software is running on the remote host?

Regards,
-Mat