Solid State Logic Multichannel Digital Audio Interface MadiXtreme - Manual (Page 29)

Using the WDM/KS drivers (Windows Vista)
In Windows 2000 and XP, multichannel audio cards were
treated as surround devices. A 16 input/output audio card such
as the Soundscape Mixtreme would be seen as a 16 channel
surround device, a 64 channel audio card (such as the
Soundscape Mixpander) would be seen as a 64 channel
surround device.
Since this was not suitable for DAW software, the Soundscape
driver implemented stereo and/or eight channel ‘virtual devices’
on top of the actual audio device.
In Vista, the way audio devices are handled has been changed
several times by Microsoft. At the time of writing, only the first
input and output virtual devices are seen by Vista.
Despite this, DAW applications should still be able to see all the WDM/KS devices, as shown here in Cakewalk Sonar:
Note however that most current audio applications can use the SSL Soundscape ASIO-2 drivers (including Sonar).
Page 23