What is the Windows Equivalent of the en_US.UTF-8 Locale?

Windows Equivalent of en_US.UTF-8 Locale

Introduction

If you've encountered issues with code portability between different Windows systems and locales, you may be wondering if en_US.UTF-8, the commonly used locale in many programming environments, has an equivalent in Windows. This article delves into the complexities of locale handling in Windows and provides a solution to ensure code functionality across various systems.

The Challenges of Locale Handling in Windows

Historically, UTF-8 was not allowed as the system locale in Windows due to concerns that its use might break functions relying on multibyte encodings. However, Microsoft has gradually introduced UTF-8 locale support starting with Windows 10.

The Solution: Enabling UTF-8 Locale Support

To enable UTF-8 locale support for your code, you can utilize the following methods:

• Using the Beta Flag (Windows 10 17035 and above):
  In the region settings of Windows 10, enable the "Beta: Use Unicode UTF-8 for worldwide language support" checkbox. This sets the locale code page to UTF-8, allowing you to use setlocale(LC_ALL, ".utf8").
• Using App-Local Deployment (Windows 7 and later):
  You can manually deploy your application with the UTF-8 locale using an app-local deployment. This requires linking statically with the latest version of the Windows SDK.
• Compiling with MSVC Options:
  When compiling with MSVC, you can specify the /execution-charset:utf-8 or /utf-8 options to force the use of the UTF-8 locale.
• Setting the ActiveCodePage Property in appxmanifest (Windows 10 later than 17134):
  Specify the ActiveCodePage property as UTF-8 in your appxmanifest to enable UTF-8 locale support within the application.

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