X1 Desktop Search, which many of you downloaded for free from a link I posted earlier, has several Tabs for different search filters, such as e-mail, documents, etc. The documents tab does not include WordPerfect files. (A request has been made to fix that in the next release.) However, you can fix it yourself by the following steps.

Click on Documents tab
In the TYPE window you will see the file formats listed in the following format " OR pdf= "
At the end of that list type <space> OR wpd=
From the toolbar click File and then Save.