Windows Media Player 9, 10 or 11 running on Windows XP and Windows Media Player 11 running on Windows Vista are all capable of decoding and playing HDCDs on personal computers with a 24-bit sound card installed.
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This is the best HDCD database (make sure to click on the 'English' button!)
along with Keith Johnson's Reference Recordings
I don't know if MS continues to license HDCD for new recordings, but I assume they do. Keith Johnson would know since he currently uses HDCD (which he invented.)
Psacanli -- how insightful! OK, here's the deal: I do use Wadia equipment, which does not decode HDCD's per se, however, because Wadia uses proprietary software to do D/A conversion (rather than an IC chip) their DAC's don't throw away (filter out) the HDCD information (bits). So although there's no 'HDCD' graphic when playing an HDCD, the HDCD sonic benefits still come through in all their glory!