There are plenty of apps that let you mount a disc image (like an ISO file) as a virtual drive in Windows. And to be honest, WinCDEmu is just another one of those apps, without too many special features. But the utility is light weight and open source, so it might be worth checking out if you're into those things.

Once you've downloaded and installed WinCDEmu, you can have Windows treat any ISO, CUE, BIN, RAW, IMG, or SMB network share as a hard drive just by double clicking on the file. If another program is already your default utility for mounting images, you'll need to right click on the file and select "open with vmnt" to use WinCDEmu. You can unmount a file by right clicking on the virtual drive letter in Windows Explorer and clicking "eject."

[via gHacks]