How to have my customized extension?

Question

I have recently found a .htaccess trick in which I can remove file extension from the URL, example.com/file.html looks like example.com/file

Now my humor says that I can replace any extension to my own, I want example.com/file.html to be example.com/file.syml

Is this possible?? or I am just daydreaming?? If this isn't possible then how does Microsoft uses MSPX, I think MS stands Microsoft.

Answer 1

The AddType directive lets you specify what MIME type(not entirely a complete list) a given file extension should be processed as. To make an arbitrary extension be processed as HTML:

AddType text/html .whatever

Note that there's generally very little reason to do this sort of thing, and it mostly just introduces maintenance work.