Disk Image Viewer is a classic app to browse EXT2 & FAT disk images.

The Disk Image Viewer allows you to browse hard disk images in EXT2 (Linux) and FAT (DOS, Windows) file systems. It also allows you to copy files from the images as well.

Main Features:

support EXT2, FAT12 and FAT16 file systems

support multipartition harddisk images

disk images automatic recognition

support the disk images in DDI (DiskDupe Images) format

drag-n-drop

Freeware

While not updated since 2003, MajorGeeks has tested it as recently as 2018 and found it works under Windows 10, as documented in the screenshot below.