Someone has written a great utility that allows you to use your PC as a
 file server from your Apple ][ and I believe vice-versa.  I forgot what
 it's called but I believe the website where the software can be found is
 listed in the Emulators subsection of the Apple Resources section of the
 VCF Link Library:
 
http://www.vintage.org/cgi-bin/links.pl#apple
 Sellam Ismail                                        Vintage Computer Festival
 ------------------------------------------------------------------------------
 International Man of Intrigue and Danger                
http://www.vintage.org
  
I think the one you're referring to is Apple II Oasis.  Includes a Disk
Server app that allows you to set up a virtual hard drive for the
emulator; IIRC, also allows PC <-> Apple II communication via null modem
cable (useful for converting your old floppies to disk images suitable
for emulator consumption, and vice versa).
Apple II Oasis homepage:
http://www.geocities.com/SiliconValley/Lakes/4414/A4W.HTM
Product is shareware, registration is $25 US.
Mike
http://tarnover.dyndns.org/
Tarnover - The Apple II Repository