You can configure the App Volumes agent to interact with mapped volumes by using a system path to the volume, instead of mapping it to a drive letter.
Most modern applications are compatible with this behavior, but some applications might require a drive letter to access program or application files. To support such situations while maintaining the familiar user interface, App Volumes can hide the drive from Windows Explorer after it is mapped.
Configure this behavior with the DriveLetterSettings registry value. The value for DriveLetterSettings is in a hexadecimal format, and any number of flags can be combined to implement multiple parameters.
Hide drive letter for writable volumes.
Hide drive letter for AppStack volumes.
By default, a drive letter is not assigned to either application packages or Writable Volumes.