About the "!", if you hover over it you should get a pop-up message for newbies stating that using wasapi-exclusive will prevent any other system sounds to be heard.
MusicBee will play DSD over DOP for certain sample rates when using ASIO drivers configured correctly. DOP 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..
About the ONLY hard data we have on this is from personal tests done by hiccup 5 years back (
https://getmusicbee.com/forum/index.php?topic=34298.msg187960#msg187960). It is likely to remain so unless other DSD users, which seems to be an extremely small group based on the lack of response, provide some of their own experiences here. I do not own a DAC.
About your lack of ASIO drivers, have you tried the Realtek site (
https://www.realtek.com/Download/List?cate_id=593), or the Microsoft Update Catalog (
https://www.catalog.update.microsoft.com/ScopedViewInline.aspx?updateid=3b0cc198-361d-4c99-ac77-bd116c97c4f3). For the latter the update would need to be done via Device Manager "Update Drivers" then point to the package. But you said your DAC supports ONLY Wasapi Exclusive, so...
Finally, you could try one of "ASIO emulators" that ride on top of Wasapi Exclusive like ASIO4ALL, FlexASIO, etc. If you find a working solution please share it here.
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