If you wish to send files that are in formats not supported through the Control Panel, you may use the Onefax Print to Fax Driver.

The Onefax Fax Printer driver is an add-on component that you can install on your computer making your Fax account with Onefax a selectable option under the Print Menus of any software.
If you have yet to install the driver, you can download our software from the downloads section.