I was getting the error message “Error: 0xc1420117” when I tried unmounting a wim file.
To give you a little background about my machine…
It’s is a Windows 2012R2 server with WDS, MDT installed. I installed MDT I needed to install Microsoft ADT which also includes Dism.
If you open a command and run dism the program just runs.
After a little bit of fooling around, I noticed the system had TONS of dism files on it. To resolve the issue you need to run the most up-to-date version. A way to check which dism files are on your computer is to open a command prompt and type:
- dir C:\dism.exe /s /a
The output will look similar. Notice how the file in the C:\deploymentShare\Servicing\x64 has the most recent file where as the Windows\System32 dism file was made back in 2014.
Using the most recent version of dism I then ran the commands:
dism /unmount-wim /mountdir:C:\dismmount /discard
NOTE – My mount drive is “C:\Dismount”
Hopefully, this will help you successfully fix your Dism Error: 0xc1420117