Create a custom file extenstion in VB 2008

Question

I have been doing a lot of searching on the web and cant seem to find a clear way of creating a custom file extentsion. I know to associate the file extension to a certain program, but how do create a format for the custom file extension?

Answer 1

You can do that as well through setup application as described in Walkthrough: Deploying a Windows-based Application, and you can pick any extension you like. I prefer to use abbreviation created from application name, and try to find if this extension is not in use. If extension was in use, then old reference (link between file type and application) will be broken. Use of 4 characters extensions will help with better chance of extension to be unique.