i use ADF Blitzer to put adf from my pc (copied onto a cd) to my Amiga. And it work great even have it as a button in D Opus.
Otherwise i extract it (the adf) from my Win 7 system into my Special Amiga Cd i make. I have set up my Win 7 to be able to view and copy what is inside adf files (as long as its a WB disk).