http://www.microsoft.com/whdc/archive/usbprint.mspx

The Windows 98 operating systems did not include an in-box kernel-mode
USB print driver. Because of this, a vendor-supplied USB print driver
was originally needed for USB printing. Microsoft has since made the
USB printing solution available to vendors for redistribution with
their printer drivers for the Windows 98 operating systems. The
Microsoft USB printing solution for Windows 98 and Windows 98 Second
Edition will be available for redistribution until June 30, 2007