Although it is relatively easy to assign a drive letter to a physical or removable drive, or to a network path for that matter, it isn’t quite as obvious how one goes about mapping a drive letter to a folder in Windows.
Funnily enough, this ability has existed in Windows via the subst command for quite a while now, going all the way back to Windows XP!
If you are a keyboard ninja then you would of course jump straight to a command line and start banging away with the subst command, but for the rest of us out there the easiest method by far is to make use of a simple utility called Visual Subst, which gives you a nice graphical interface to assign drive letters, but also does something that the command line version can’t – you can set your virtual drives to apply again at startup.
Once you’ve downloaded the utility, simply run it, use the browse button to select the path you want to map to, and click the green plus symbol to choose enforce the chosen drive letter.
As simple as that. If you want to save your mapping so that it is more permanent, hit the “Apply virtual drives on Windows startup” option.
Related Link: http://www.ntwind.com/software/utilities/visual-subst.html