Datacolor User to User Support Group.

Hi,
I use the full line of datacolor color management on Windows 7, 64 bit with Photoshop CS5.  Canon has made available (11/15/2010) a print plug in for their iPF 6300/8300 printers.  They do not use Adobe CMM in the 64 bit mode, but rather one must use "OS color engine" or some such phrase.  Does this mean that the default is Microsoft WCS which is the way I interpret it?  If so, is there any loss by using the WCS default? (They ask you to contact Adobe for their 64 bit Adobe CMM which is NOT available as far as I can tell from the Adobe website)  Thanks to anyone who may shed light on this issue.
Paul Hathaway