Or try the latest WinUAE which comes with RDB-support
There seems to be some misunderstanding about this. The RDB support which has just been introduced in WinUAE is for hardfiles only! It allows you to make more than one Amiga partition inside UAE hardfiles, and therefore the use of AmigaOS specific file systems like PFS or SFS. Up to now you were stuck with one partition per hardfile and no way of seeting up RDB information.
There is still no way to read actual Amiga disks from WinUAE, and you won't find anything back-ported from AXL because H&P don't believe in the GPL much.