Ext2Read is a Free & Open Source Software which allows you to browse
your Linux partitions in a very Windows Explorer-esque interface.
Unlike other tools Ext2Read also supports ext4 filesystem, even if
extents feature is enabled. Like the name suggests – Ext2Read can only
read, not write to the partitions – so in case you are paranoid about
the tool causing data corruption to your Linux partitions, you can
drop those fears.
Here is the full article.
http://techie-buzz.com/foss/how-to-access-your-linux-partitions-from-windows.html