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Open source ext2/ext3 file system driver for Windows (2K/XP/WIN7/WIN8)
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Ext2Fsd is an ext2 file system driver for Windows (2K/XP/WIN7/WIN8). It’s a free software. Anyone can modify or distribute it under GPL2.

Features Ext2Fsd supports:

ext2/ext3 volume reading & writing
ext3 journal replay when mounting
various codepage: utf8, cp936, cp950 …
mountpoint automatical assignment
large inode size: 128, 256, …
large file size bigger than 4G
CIFS sharing over network
htree directory indexing
ext4 extent read-only, no size truncating and expanding support
Fast fsck (uninit_bg) and group block checksum support
64k block-size, support compatible to Linux ext4 and e2fsprogs
OS: 2k, xp, vista, server 2003/2008, win7

Features Ext2Fsd doesn’t support:

fully ext3 journal support
ext4 extent support
LVM and Linux raid (md)
NT4 is no longer supported.