WinCDEmu Portable

WinCDEmu os a cd/dvd/bd emulator allowing you to mount ISO, CUE, and other image files and have them show up as a drive letter. Like all system utilities of this nature, WinCDEmu requires admin rights.

WinCDEmu is an open-source CD/DVD/BD emulator - a tool that allows you to mount optical disc images by simply clicking on them in Windows Explorer. It supports one-click mounting of ISO, CUE, NRG, MDS/MDF, CCD, IMG images and an unlimited number of drives. WinCDEmu does not occupy a drive letter when not in use. Data, DVD-video and BD-video images are supported.

https://portableapps.com/apps/utilities/wincdemu-portable