If you are using an ISO you will need to mount it first so that you can explore it.
Locate the sources folder and find either install.wim or install.esd
Open an elevated command prompt and type the following, remeber to change F: to the letter of your ISO or USB
dism /Get-WimInfo /WimFile:F:\sources\install.esd /index:1
or, if you have install.wim
dism /Get-WimInfo /WimFile:F:\sources\install.wim /index:1
This works in Windows 10, but Windows 7 may give an error, if so please type the following
dism /Get-WimInfo /WimFile:F:\sources\boot.wim /index:1
