http://www.yubsoft.com/imgdrive/portable.htm
ImgDrive is a application for users who need a simple, reliable drive emulator that enables them to mount disc image files saved to various formats. It is very easy to use and does a good job of staying out of your way, as it rests in the system tray.
FeaturesSupport File Type
- Use CD/DVD/BD images directly at 200X speed without the actual CD/DVD/BD
- One-click mounting of ISO, CUE, NRG, MDS/MDF, CCD, ISZ images
- Mount APE, FLAC, WAV, WavPack, TTA file as AUDIO CD
- Support up to 7 virtual drives at the same time
- Support Windows 2000/XP/Vista/7/8/10
- Support multi session disc image (CCD/MDS/NRG)
- ImgDrive is freeware, you may use it at no cost
- A special portable version is available
- .CCD - CloneCD image files
- .CUE - Cue sheets files of APE/FLAC/TTA/WAV/WV/BIN
- .ISO - Standard ISO image files
- .ISZ - Compressed ISO image files
- .MDS - Media descriptor image files
- .NRG - Nero image files
Not tested, but of course it's not "portable"
Possible alternative to Portable WinCDEmu