I have been asked several times what my favorite Windows program is for accessing ISO images of CDs and DVDs. To just browse an ISO and extract files, I prefer 7-zip. To mount them as a drive letter I like MagicISO. I am partial to tools that do not need installation, but of course something like this must install a driver, so it requires an installer. This software is very lightweight. The driver is only 250K and you only need to run the client to mount and dismount disc images. Some of these kinds of tools are used by gamers and others to make illegal copies of CDs and that software may be detected as malware, but MagicISO is still passing all antivirus scanners on Virustotal.