To launch the External Editor, you must first set it up.

To set up the External Editor:

1.    Choose Tools|Environment Options|Internet.
2.    Click the New button and type a description and file type extension or highlight an existing file type and click the Edit button. This opens the New or Edit Type dialog box.
3.    Open the Edit Action list box. This list box displays the available edit actions stored in your computer's registry for the file extension(s) you entered in the Extensions field.(Edit, Edit with Notepad, and Open are typical actions, but other actions may be available as well, depending on what software applications are installed on your computer.) Choose the edit action you want to perform on files of the displayed type when you choose Tools|External Editor or click the External Editor icon in the Internet toolbar.

4.    Click OK to close the New or Edit Type dialog box.
5.    Click OK to close the Environment Options dialog box.
To launch the External Editor:

Once you have opened a file of the desired type in the IDE:

1.    Choose Tools|External Editor or choose View|Toolbars|Internet and click the External Editor icon.
2.    Your Web application launches in the editor you have installed.