depending on the DAC's driver it likely has a ASIO DSD mode you can possibly see it switch to in its control panel when using it
Not in my case unfortunately, I use XMOS USB DAC driver and it has literally no options to configure (only streaming ON/OFF and buffer settings).
The alternative to ASIO is to use WASAPI exclusive if the DAC supports DoP but that's also an exclusive output.
I have this ability (up to 4XDSD on DoP, but I) it sounds a bit worse to me (subjectively) and ii) since it's still exclusive, then...
I suppose the other alternative is to convert DSD to PCM but that's likely not desirable here.
Indeed, it's not I'd like to have, especially not all my files are high-res.
I assume you mean you're using the DSP Studio > Output Format > Output Encoding set the 8xDSD option? If so, do know that converts everything including PCM to DSD and is a lossy conversion and resource intensive for the system to do on-the-fly. Unfortunately, the only way to avoid the issue with needing to use exclusive mode would be to set the Output Encoding feature set to None and instead use DSD bitstreaming for playing back DSD content only and leave PCM as-is with WASAPI or ASIO. It won't solve the issue when playing back DSD content as DSD requires exclusive mode but it would allow PCM to play as it did before.
Yes. that's muy current config. And, wow, thanks a million for such a comprehensive explanation!