As I understand it, audio drivers were never allowed to use the "unclassified" program anyway; the unclassified program was meant only for devices which didn't fall into a more specific category. The HCK is now smart enough to figure out what kind of tests to run on a device based on the interfaces it exposes. So if it exposes KSCATEGORY_AUDIO, the HCK knows to run the audio tests. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of wade dawson Sent: Thursday, January 9, 2014 7:30 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Unclassified Driver Signature in HCK Now that the latest windows HCK (was WLK 1.x) no longer seems to allow "Unclassified Driver Signature" submissions, has anyone been able to determine wether that really means that complete compliance with the latest HCK's every (auto-detected) whim is the only way to get your driver(s) on Windows Update now? wdawson61@xxxxxxxxx<mailto:wdawson61@xxxxxxxxx> DT Multimedia