This is been a pain for me as well. Moon+ is excellent for annotating EPUBSs and PDFs, and it's alright for accessing the PDF annotations on Windows... but I still have to do a bit of file copying for this. I keep waiting for a solution that will link an Windows ereader to Moon+ annotations. I suppose the best solution of that would be for Moon+ to be ported to Windows. Know idea if that will ever happen.
This isn't really a direct answer to your question, but one way to access Moon+'s annotations would be to install an Android emulator on Windows to get usable access to annotations--I'm always copying and pasting quotes and it's useful for me to have access to full context of highlight rather than just highlight (and note). Anyway, I tried this with Nox and it seemed to work pretty well, but Nox kept crashing my Windows. Maybe the updated version of Nox will work better... Anyway, that's one semi-solution.
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