I've a Windows 8.1 machine, and have accidentally deleted Utilman.exe. I would like to know the EXACT SHA-256 hash of this version of the file. (64-bit OS, x64 processor, Windows 8.1) If there's anymore information that you need to know, please ask. Thanks.
This is an XY problem. Instead asking for a solution to your problem, you're asking for implementation of your solution, which is wrong.
You can simply run
sfc /scannow to restore the missing file.
sfc /scannowrestore the missing file in exactly required version?