My Win10 PC was updated to 1803 and I too can't find that setting as instructed either by Stephen or Frank. My PC started life as a Win7 Pro machine and got updated to Win10 so maybe that results in yet another combination....

In the registry key: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlS et\Control\Nls\CodePage I find numerous entries, and the one Stephen mentioned "OEMCP" is set to 437 -- but I also see a a Reg_DWord named: "AllowDeprecatedCP" with a value of "0x42414421"

I like how Michael Mullen dealt with this as a safe workaround ... until Microsoft makes that solution unsafe....

Bob