Question

I know there are:

• .aspx
• .php
• .html
• .htm

This is the first time I’m seeing a website with .sd at the end. What exactly does that mean and is there a wiki that explains a bit more?

For example, this website:
http://www.racingpost.com/horses2/results/home.sd

First time I’m seeing it and I’m just curious.

Answer 1

Edited for the url you added: that specific one is most likely being used with the BlueDragon system, a family of runtime server-side products for the deployment of CFML pages, deployed in possibly a j2ee environment.

for instance you can google the site for references:

http://www.google.com/search?q=site%3Anewatlanta.com+%22sd

or see a servlet debug page:

http://74.125.93.132/search?q=cache:yg7UIh6nRdIJ:www.lucasoil.com/landing_pages/14,3.html/+%22index.sd%22+bluedragon&cd=2&hl=en&ct=clnk&gl=us&client=firefox-a

or you may be referring to the TLD (top-level domain name).

the TLD .sd belongs to country of Sudan which is managed by the Sudan Internet Society:

http://www.isoc.sd/sudanic.isoc.sd/