MPEG, GIF, AU, etc. Action is what you want Netscape to do when it encounters a file or link with the extension given. Extension is where you put the file type extension. Click New and enter the Mimetype and application name, as well as the extension. Then choose an action for when Netscape Navigator encounters a link matching the extension.
Application is the name of the application.
Action is what you want Netscape to do when it encounters a file or link with the extension given. Extension is where you put the file type extension. Then choose an action for when Netscape Navigator encounters a link matching the extension. These are files you need to create. So when you click on .au file links, Audio Tool will launch.