This description of how to add to the available HTML editors was taken from an article on the Microsoft SiteBuilder Network. The article was located at here at the time of this writing.

The steps for adding HTML editors to the drop-down list on the Programs tab of the Internet Options dialog box in Internet Explorer 5 and later is slightly different than the steps for adding client applications like mail and news.

1. Register the friendly name of the HTML editor by adding a new key to HKEY_CLASSES_ROOT\.htm\OpenWithList.

   HKEY_CLASSES_ROOT\.htm\OpenWithList\friendly name

2. Add shell, edit, and command keys to the editor's registry entry.

   HKEY_CLASSES_ROOT\.htm\OpenWithList\friendly name\shell\edit\command

3. Enter the fully formed path of the .exe file that launches the editor in the command key's "Value data" field. Enclose the path in quotes if it contains spaces. The following example shows the Value data entry for a typical installation of FrontPage Express. Include %1 as a parameter. This parameter refers to the file name of the active Web page. "c:\program files\microsoft front page express\bin\fpxpress.exe" %1