Many thanks hiccup for some fully documented testing of this, what a breath of fresh air. Steven will have some hard data to pass along to the bassdsd.dll developer, which is probably the key to this.
While a single case, at least it can be passed on to the users that using DOP with DSD64 and DSD128 CAN WORK. Most who are following this already know what DOP is but for "them what's doesn't" it is a stream transport method that encapsulates raw DSD into a PCM wrapper. The wrapper is then discarded at the DAC and the raw DSD reassembled, resulting in bit-perfect DSD exactly as if the "stream raw DSD data" option was used. It is also not dependent on special USB drivers to handle DSD.
Why the original poster didn't get involved in the testing I don't know, but any others who can do so, PLEASE DO. For now I'm back to my old friend Wasapi-Exclusive, as I have no DSF in my collection, nor do I own a DAC (yet). And I just realized Realtek HD came with Asio drivers a week ago, which while working fine with MusicBee have no discernible advantage over Wasapi-Exclusive other than the ability to play DOP/DSD. But the concept is cool and I hope someday becomes fully functional.