To mount an ISO image file, simply download Virtual CloneDrive. Once installed, start up the application.
To select the number of virtual drives that you want to have at your disposal, under the Settings tab, use the Number of Drives dropdown and select the desired number of virtual drives you want to have.
Click OK and then go to computer to see the newly created drive(s), right-click the new virtual drive, go to Virtual CloneDrive, and select Mount.
Browse to the location of the ISO image file and click OK. The image file will then can be accessed as if it were an actual CD or DVD.