In order to configure WinTalk as a helper application for MIME type "application/x-wintalk", file extension ".wtk". In Netscape, this is in the Options->General Preferences dialog. Select the "Helpers" tab, and then click "Create New Type". Enter "application" for MIME type, and "x-wintalk" for subtype. A new line will then appear in the file type listbox. Now enter "wtk" in the File Extensions box, click "Launch Application", and enter the location of the WinTalk 1.25 executable on your system by typing it in or selecting "Browse" and finding it by browsing your hard drive.