I thought I'd post a how to on accessing Wubi disks from the Windows installation.
First, install Ext2 Files System Driver, an open source Ext2 driver by Matt Wu at http://www.ext2fsd.com. You need this to let Windows be able to read Ext2 file systems.
Next, install FileDisk, a virtual disk driver under GNU license. The home page of FileDisk is http://www.acc.umu.se/~; the download link is http://www.acc.umu.se/~bosse/filedisk.zip. Instructions for use of FileDisk are in the archive-it is just a system file that adds a command line program called filedisk.
Create a batch file to mount your disks. Here is what mine looks like in lindisks.bat:
filedisk /mount 0 c:\wubi\disks\system.virtual.disk l:
filedisk /mount 1 c:\wubi\disks\home.virtual.disk y:
filedisk /mount 2 c:\wubi\disks\swap.virtual.disk x:
You can add the .bat file to your start up if you want access when ever you start up. You should now be able to use these drive mappings to look at any of your linux files. I have not had any problems reading files so far, but some files do not copy back and forth between Windows and the disks. You get an error message when this happens. The files you are most likely to use, such as documents, work very well.