File Extenstion Register

[Suneet]

What is the procedure of registering a new extenstion say for example  "*.SNL".

I want to use a file with this extension for a commercial application, so I want to know if I can use it without any restriction or do I have to check for copyright. Also on the other hand if I have to copyright this extension where can I register this and what is the procedure.  

thanks

[merlin_2]

schools out........ask the teacher......

[vibhor_agarwalin]

Use it straight away  

Update us if someone catches you