If you open the application and click on the Add files button, a dialog will also appear. Click the drop down menu with supported extensions and choose the one you need. If it's not on the list, then it means you can't add it nor you can modify the supported file formats.
If you open the application and click on the Add files button, a dialog will also appear. Click the drop down menu with supported extensions and choose the one you need. If it's not on the list, then it means you can't add it nor you can modify the supported file formats.