I helped set up a firewall recently and have noticed some strange behavior. If you use netscape to download an hqx file to a MAC through 
the firewall it downloads it as text into the browser. If you bypass the  
firewall (modem) it unstuffs it and saves it to disk. Netscape on the mac is set 
up to run unstuffit on application/macintosh-binhex40 and the type is declared 
in the mime.types file on the firewall in the proxy server directory. I actually 
tried this from PCs and UNIX too. It should be an unknown data type, but they 
all treat it as text. Mosaic works fine of course. 
Has anyone else seen this? If so is it a netscape bug, or a firewall 
configuration problem? All other ftp clients go through just fine. Any 
suggestions at all would be appreciated