Re: "this is just how MS Word works"
EN-ZE confirmed. My bad. Though is seems it does not have an "official" name? (IsNeutralCulture = $False offers some interpretations)...
PS C:\> [cultureinfo]::GetCultureInfo("en-ze") | Select-Object *
Parent : en
LCID : 4096
KeyboardLayoutId : 1033
Name : en-ZE
IetfLanguageTag : en-ZE
EnglishName : Unknown Locale (en-ZE)
TwoLetterISOLanguageName : en
ThreeLetterISOLanguageName : eng
ThreeLetterWindowsLanguageName : ENU
CompareInfo : CompareInfo - en-ZE
TextInfo : TextInfo - en-ZE
IsNeutralCulture : False
EN-SH is:
PS C:\> [cultureinfo]::GetCultureInfo("en-sh") | Select-Object *
Parent : en
LCID : 4096
KeyboardLayoutId : 1033
Name : en-SH
IetfLanguageTag : en-SH
EnglishName : English (St Helena, Ascension, Tristan da Cunha)
TwoLetterISOLanguageName : en
ThreeLetterISOLanguageName : eng
ThreeLetterWindowsLanguageName : ZZZ
CompareInfo : CompareInfo - en-SH
TextInfo : TextInfo - en-SH
IsNeutralCulture : False