[squid-users] mime.conf

I have a question.

RFC1945,2068 said 'If the media type remains unknown,
the recipient should treat it as type "application/octet-stream".'
But, default content-type of squid is "text/plain" in mime.conf.
Why?

In case of "text/plain", 0A converted to 0D0A. So,I can't
download image file correctly which not defined in mime.conf
by ftp. (example: test.tx_)

--