Find Windows version in a ISO file

First mount the ISO to a computer (in W10 just double click). Then open a command prompt as an administrator and type:
dism /Get-WimInfo /WimFile:F:sourcesinstall.wim /index:1

(F is the drive letter of the mounted ISO file)
The output will show you what ISO version you are using


Find cached credentials

Open a command prompt and type:
rundll32.exe keymgr.dll, KRShowKeyMgr

Or go to All Control Panel Items - Credential Manager