Go to: System Properties → Advanced → Environment Variables → System variables → New
: Set the NLS_LANG string to: AMERICAN_AMERICA.AR8MSWIN1256 . Go to: System Properties → Advanced → Environment
Specifically for Windows-based Arabic support. Go to: System Properties → Advanced → Environment
NLS_LANG = ARABIC_UNITED ARAB EMIRATES.AR8MSWIN1256 Go to: System Properties → Advanced → Environment