http://wincdemu.sysprogs.org/
http://sourceforge.net/projects/wincdemu/files/
WinCDEmu is an open-source software that allows mounting CD/DVD images
by clicking at the image files in Windows Explorer.
WinCDEmu supports ISO, CUE, NRG, MDS/MDF, CCD, IMG formats and
runs on all Windows versions from WinXP to Win7.
best regards