: The client NLS_LANG in the registry does not match the encoding of the input text, or the database character set cannot store the characters.
Oracle Developer 6i (Forms & Reports) is legacy software originally designed for single-byte character sets. To correctly handle bi-directional (Bi-Di) languages like Arabic and Urdu—which require multi-byte character storage and specific rendering rules—strict environment configuration is required.
If you are starting a new database for legacy Developer 6i applications, choose AR8MSWIN1256 – it is the character set that most existing “Arabic/Urdu support” walkthroughs assume, and it has been proven to work with Developer 6i’s limitations. If you already have a Unicode database (AL32UTF8) and are encountering display issues, you can still make it work, but expect additional configuration steps. : The client NLS_LANG in the registry does
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE (On 64-bit Windows)
Developer 6i cannot reliably process AL32UTF8 in its native layout engines because it is a legacy 16-bit application. Therefore, the client NLS_LANG should be set to match the Windows ANSI code page for Arabic/Urdu, which is . The Oracle 10g database automatically converts data between AR8MSWIN1256 (client) and AL32UTF8 (database). Step-by-Step Registry Edit: Press Win + R , type regedit , and hit Enter. If you are starting a new database for
: Verify that NLS_LANG is set to AMERICAN_AMERICA.AR8MSWIN1256 in both database and client registry. A common mistake is setting it to AMERICAN_AMERICA.UTF8 or AMERICAN_AMERICA.WE8MSWIN1252 , neither of which supports Arabic properly
When creating a database specifically for Arabic or Urdu applications, the AR8MSWIN1256 character set is often the recommended choice. This character set efficiently handles right-to-left text while maintaining compatibility with Windows Arabic locale settings. Therefore, the client NLS_LANG should be set to
Add a trigger on Arabic/Urdu fields:
From SQL*Plus:
Dev6i cannot display complex script shaping (like initial/medial/final forms of Urdu characters) fully in all versions. Basic Arabic works reliably; Urdu may show disconnected glyphs.
