Nuwave DAC

I have a PS Audio Nuwave DAC can I play DSD files through Windows 7 and JRiver software

Not without converting them to PCM files. I haven’t tried it but apparently JRiver can do that on the fly. See

If you try to play them on JRMC it will ask you if you want to proceed with the downsampled file. All good. You will have to get a new DS to play dsf files like you get from Acoustic Sounds without the need to downsample.