Can undecrypted files also be stored in a directory instead of drive letter?

When one wants to create several vaults, the 26 letter limit for the drive letters comes soon. If one already has 2 disks permanently, 2 DVD-drives, 2 exchangable disks, some letters given to several NASs in the home network, the amount of vaults availabe is even smaller. Is there a way to put the undecryped files in a directory instead of a drive? Then the amount of vaults would be free.

Hi. I assume that you use windows.
Yes that possible with the Option Custom mount points and dokany.