What software to play .dsf or dsd files for Windows 10?

Thanks both for the responses.  As for JRiver, is the fee a one time fee or is it an annual fee that you have to renew every year?

I also had a look at Foobar.  Hm... it seems like I may need an IT certification :-).

J River is a one time payment but you are better off by buying each new yearly update as it is not too expensive and little buugs are sorted out with each new update. Regarding file playing you can tune J River to upsample all files regardless of what they are to play as DSD through your DAC which is what I do and they do sound very good that way.

I have JRiver 23 and I see no reason to upgrade to JRIver 24.  JRiver, through its forum, continues to support 23 (and older versions I think).

That being said, it is beyond annoying that they introduce new versions so often, rather than simply passing along improvements as do many other software vendors.  I had 23 for less than a year before they released 24.  The upgrade price is about half the original price.  One can, it seems, upgrade after a couple of versions have passed through.  Perhaps that's what I shall do.

Another software to consider is HQ Player. I have not tried it yet, but may be less user friendly, but may be better for sound quality. Looks interesting..
https://www.signalyst.com/consumer.html
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I`ve tried alot of players and the one that sounds best for DSD is Album Player. Easy to setup, can also work as a renderer if you want to use it with Kinsky and Minimserver.

http://vv.uka.ru/aplayer_eng.html