No no not all - it just depends on the configuration of the webserver, of course if you are on windows which depends on the extension to know what to do with the file then you are a bit stuck, short of some ISAPI filter magic or creating some completely different extension, but with , say Apache, this is common practice - of course if you are using mod_perl the thing in the 'file' position at the end of the url may not actually be a physical resource at all.

/J\