Floppy disk images (.img) files in this folder have been created using DskImage, and they can be mounted like this:
Linux:
sudo mount -o loop floppy.img /media/dir/
MacOS:
Just double click on the .img file.
You can also use 7z:
7z x floppy.img
compusound.img: (720 KB) COMPUMAGAZINE Ed. extra #3 (1994)