Ext2fsd and ext2explore seem to the most popular choices on the web for the job you want. However, bare in mind that they don't always leave the linux filesystem in a consistent state.
Anyway, these options do not work for you and i am not aware of a reliable application that can do what you want. The best thing to do is to use a linux live cd (ubuntu, puppy linux, damn small linux, etc) to boot your pc from it and then do anything on the ext4 partition like a boss.