I have a huge pile of old (DOS, probably FAT12) floppy image files which I'd like to browse quickly, without having to loop-mount each of them first. Something like Midnight Commander's "iso9660://" virtual file system, just for floppy images.
How can I quickly get a list of files on these images, or perhaps even open these images as (readonly) archives?
Both 7zz from 7-zip and 7z from P7Zip will list contents of floppy images. Just run 7z l floppy-image.img or 7zz l floppy-image.img and you will get the contents listed.
If you are using Midnight Commander, you can also duplicate the 7zip section in ~/.config/mc/mc.ext.ini and add some minor changes:
[Floppy]
Shell=.img
ShellIgnoreCase=true
Open=%cd %p/u7z://
View=%view{ascii} /usr/libexec/mc/ext.d/archive.sh view 7z
This way mc will let you browse *.img images.
If you are using Double Commander, just go to Configuration/Configuration of Archivers and add img to the list of extensions of 7Z.