Maybe a cable is available as a spare part from Creative, Audigy cards used to come with a "3.5mm to Single RCA Coaxial Cable" for digital sound out...

HD621, G98DH, G68ADV, Bc Acoustiqe ACT A3, 5200C DSP33, NuForce Reference 9 monoblocks, 2x SB3's, Velodyne DD-15 & DD-12 Subwoofers and a Meridian sub.