The GNU Midnight Commander has a nice feature, called extfs (External File 
System). All thinkable file types can be read if an according script is 
present. Included with the Midnight Commander are scripts for e.g. zip 
archive files and for rpm package manager files. I missed some and wrote my 
own. I hope they are useful for others too.

The following extfs filesystems are implemented:
u7z:  Reading 7-Zip archives
uadf: Reading Amiga adf disk images
uarc: Reading old arc/pak archives
ucab: Reading Microsoft cabinet files
udar: Reading dar disk archive files
uimg: Reading and writing FAT disk image files (DOS/Windows/Atari)
uiso: Reading ISO 9660 CD images

You can do whatever you want with this software. Give it any license you 
want (either open or closed source, either free or commercial), replace my 
name with your dog's name, sell it for billions of dollars, anything you can 
imagine. Please remove my name if the functionality changes a lot. Just one 
thing: I've tried to make the virtual file system scripts safe but I won't 
be responsible for any damage it may cause.