How to read ext4 partitions on Windows?

Ext2Read works well. It can also open & read disk images ( eg: Wubi disk images)

Ext2Read is an explorer like utility to explore ext2/ext3/ext4 files. It now supports LVM2 and EXT4 extents. It can be used to view and copy files and folders. It can recursively copy entire folders. It can also be used to view and copy disk and file

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DiskInternals Linux Reader

This program plays the role of a bridge between your Windows and Ext2/Ext3/Ext4, HFS and ReiserFS file systems.

Linux Reader Website

Features

  1. Integrated with Windows Explorer
  2. Reader for Ext2/3/4, ReiserFS, Reiser4, HFS, HFS+, FAT, exFAT, NTFS, ReFS, UFS2
  3. Can create and open disk images
  4. Freeware

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WARNING
According to multiple reports, it does not work on Windows 10 version 1909 and later

EXT2FSD works for reading ext4 filesystems, though not all of ext4's capabilities are supported.

After installing set a letter to each Linux drive (see screen-shot) and then restart the application. After that Windows Explorer will show the Linux partitions as any other partition.

setting a letter to a Linux drive