How to know if the Win2012R2/Win8.1 April Update is installed?

I found a way to do that, based on information form technet and was trying to do using WMIC, but i found that it´s easy using powershell

"...To confirm the exact version of Windows Server 2012 R2 that is installed on a computer, run Msinfo32.exe. If Windows Server 2012 R2 Update is installed, the value reported for Hardware Abstraction Layer will be 6.3.9600.17031...."

So i can get this info by using:

Get-ItemProperty -Path c:\windows\system32\hal.dll | fl -Property VersionInfo

VersionInfo : File:             C:\windows\system32\hal.dll
              InternalName:     hal.dll
              OriginalFilename: hal.dll
              FileVersion:      6.3.9600.17031 (winblue_gdr.140221-1952)
              FileDescription:  Hardware Abstraction Layer DLL
              Product:          Microsoft® Windows® Operating System
              ProductVersion:   6.3.9600.17031

How can I get ONLY the "FileVersion" and/or "ProductVersion" informations on output?