Where is avcaudio.sys?

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Severity One

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I'm trying to connect an IEEE 1394a/FireWire/i.Link audio device (to be precise, a Sony LISSA hi-fi set) to my Windows 10 PC. I'm aware that IEEE 1394 isn't exactly state-of-the-art, but it's a very nice set, and I want to use it as an audio device.

The receiver (I haven't connected the CD player or MD deck yet) is recognised as two different devices by windows, but in the area reserved for devices that it doesn't know what to do with it. I'm suspecting because of the absence of avcaudio.sys.

According to the Microsoft documentation (which I cannot link to, on account of being a newbie), it should be part of Windows. But it isn't anywhere on my installation, nor can it be found on either of the Windows 7 installation media (32 and 64 bits). There's avc.sys and avcstrm.sys, but no avcaudio.sys.

Short of writing it myself (I've never done any Windows development, but I'm rather experienced, so how difficult can it be?), what are my options of locating this elusive driver?

Thanks!

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