WindowsでExt2,Ext3,Ext4ファイルシステムを読む

Ext2readというソフトがよさそうです。
Ext2read - View ext2/3/4 partitions from Windows

FEATURES:
Simple UI designed using QT4.
View/Read Ext2/ext3/ext4 partitions.
Linux LVM2 Support.
Ext4 Large File support (untested).
Recursively Copy the entire folder or even /
Support for external USB disks.
Support for disk and filesystem images. For eg. Wubi users can just
open their root.disk file through this program.
LRU based Block cache for faster access.
Unicode support.