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(on Wikipedia)
https://sourceforge.net/projects/ext2fsd/
http://www.ext2fsd.com/

Ext2Fsd is an open source Linux ext2/ext3/ext4 file system driver for Windows.

Old notes ∞

To allow windows to read ext2 (and 3/4)

fdisk -H 32 -S 32 /dev/x

1 +15900 cyl
2 -> make an extended partition, with all remaining space
5 +74000 cyl
6 +12000
7 +15900
8 4309 (the rest)

mkfs.ext4 -O has_journal \
          -O dir_index \
          -O extents \
          -O extents \
          -E stripe-width=32 \
          -I 128 \
          /dev/x

-I 128 is for compatibility with the driver I use in Windows to read ext2 (and 3/4).