This handheld device works with both Macs and PCs, and can serve as a portable USB 1.1 hard drive for either system--though by using the USB connection interface, you can expect a long wait when loading data to the device from your computer.
Still, in the first few weeks or months of owning your Window 8 device, you might find yourself making do with less familiar alternatives, or just loading up the browser version of the app.