I use DISM to customize and update images that I deploy to our computers. I do this on an external drive because its really heavy on I/O. A while ago I appear to have left the image mounted in my F drive as F:\WIN81MOUNT. The files are there. Running
dism /get-mountedwiminfo however shows that there are no mounted WIMs. As such, I have no idea how to delete WIN81MOUNT as I cannot remount, unmount, or just delete the folder (files have permissions of things like SYSTEM, as they are in the windows image).
How can I force this WIM to unmount, or remount? I have tried all the standard options such as unmount-wim, cleanup-image, remount-wim... none of them work, saying the request is not supported. The log indicates "This is not a WIM mount point.".