Microsoft Windows [Version 10.0.26100.4946]
(c) Microsoft Corporation. All rights reserved.

C:\Windows\System32>dsim.exe /online/cleanup-image/restorehealth
'dsim.exe' is not recognized as an internal or external command,
operable program or batch file.

C:\Windows\System32>dism.exe /online/cleanup-image/restorehealth

Deployment Image Servicing and Management tool
Version: 10.0.26100.1150


Error: 87

The online/cleanup-image/restorehealth option is unknown.
For more information, refer to the help by running DISM.exe /?.

The DISM log file can be found at C:\WINDOWS\Logs\DISM\dism.log