posted 22 years ago
The Unices don't use file name extensions to recognize type; they use a "magic number" stored in the first two bytes of the file itself. In Solaris, the file /etc/magic documents the known types.
Browsers are different. They recognize associations between MIME types and file extensions. Also, all the major browsers let you bind an application to a file type you are trying to load. In Netscape you can find this under Edit | Preferences... | Navigator | Applications. YMMV in your browser of choice.
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