 In earlier releases like the original release of Windows 98, KMixer tried to mix every data format that passed through it, even those it did not support.It caused various problems with media players that tried to pass AC3-encoded surround sound streams through S/PDIF output of the sound card to an external home cinema receiver.This was corrected with Windows Me and provided as a hotfix for Windows 98 Second Edition and Windows 2000 SP2.