Explore2fs
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Explore2fs is an Explorer-like program for Microsoft Windows that is capable of reading ext2 and ext3 (Linux) hard disk partitions. This can be especially convenient if one has a dual-boot system with both Linux and Windows partitions, or if one uses a live-CD version of Linux that creates an ext2 partition image as a single file on an NTFS drive (such as Puppy Linux, for instance, does). It is licensed under the GPLv2.
A new version called Virtual Volumes is being developed. This new version has a layered modular design. It supports multiple filesystems and multiple disk access methods.