If you have a file extension in your application that
you cannot find listed in the Exclude File Types dialog box,
you can add these extensions to the list.
Procedure
In the Exclude File Types area, click
The New Exclude File Types dialog box appears.
In the Type text box, enter a word or phrase to
describe a set of file extensions.
In the Extensions text box, enter the list of extensions
that fall under this type of file. (Separate multiple extensions
with a comma, without a space.)