With the advent of Windows 10 and the built-in ability to mount an .iso or .img file with Windows explorer when working on older machines it’s important to know that this feature didn’t exist on Windows 7 and previous Windows Operating systems. The feature had to be added via an app. Here is a list of such apps:
Slysloft VirtualCloneDrive
https://www.elby.ch/products/vcd.html
PowerISO
Pismo File Mount Audit Package