Anyone know how to set a file's MIME type, if the file is not using a file extension. For example, I want [example.com...] to have a different MIME type, possibly using .htaccess (which I understand slightly).
If you are using RewriteRules to redirect that URL to a real page or script, you can append the [T] flag to force the MIME-type -- see the documentation on RewriteRule flags. Another alternative would be to have the script generate all the HTTP response headers, including the MIME-type.
Without any filename or a file extension to 'grab on to', I don't see any other obvious options. (Someone else might, though).