Either the browser or the server is wrong in how it's handling PCX files (which are just image files).
Not sure what Netscape's problem is but I would recommend getting rid of it and going with Mozilla instead. Netscape development has been halted, it's all but dead. Mozilla is still being developed and supported and is the source for Netscape's code anyways.
ftp://ftp.mozilla.org/pub/mozilla/pu...taller-sea.exe