how do I associate extension to file type?

[redss]

Quick question for Linux newbie: I want to associate a new file type to be a text file, just like how windows automatically identifies .TXT as text files. The extension is something new tho (not .TXT). In Linux, how can I associate this new file type with the notepad viewer?

Thanks!

 

[RaoulDuke]

.txt should do it as well

Or, just open it in your favourite text editor......it will remember the MIME type in some distros WM's