Is there a way to mount an EXT4 volume image in Windows 7?

Ext2read allows for read-only viewing, but not actual mounting, nor writing. (via #37512)

As far as I know there is no driver or application capable of writing to ext4 for Windows.

If you only need to read from it you can use EXT$ Unpacker, which is free and opensource.

http://sourceforge.net/projects/androidicsjbext/

A possible solution, would be to use VMWare to create a virtual machine on W7. Install your favourite linux OS, then mount the image for it to access, or import as a file then mount.

You could then set up a Samba/CIFS share and access from W7.