How do I delete the 'offline' directory created by dism?

Question

While creating a slipstreamed Windows ISO, I wanted to 'un-do' and start over with a better plan. I attempted to delete the workspace but the workspace had a directory called offline, created by dism, with several GB worth of files owned by System and therefore could not deleted, giving an access is denied error. Some files involved were offline\Windows\mib.bin and several .DLLs etc.

Answer 1

Run (as administrator) DISM /cleanup-wim

Expect this to delete the contents of the offline directory, even if the image is corrupt, incomplete or unmounted.

ref: Can’t Delete...Folder After Failed Servicing