Add Custom Extension dialog box

To open the Add Custom Extension dialog box, click the Add button on the File Types page of the IDE Options dialog box (Tools|IDE Options).

Use the Add Custom Extension dialog box to add a file extension to the Associated Extensions list. Note that this does not add the extension to the Recognized File Types list on the File Types page.

To associate a custom extension with a recognized file type, select a file type in the Recognized File Types list. Then, choose the Add button and enter the custom extension. The custom extension is then added to the Associated Extensions list and is associated with the selected file type.