How can I change default codepage (What GetACP() returns) on a Windows Container running in Hyper-V VM

Question

We are using Windows docker containers on a Windows host to help increase our testing bandwidth. We are using Hyper-V VM because each test may need to be isolated.
Our tests expect the GetACP() to return 1252, but in the containers, GetACP() always returns 65001.
As such the output does not match our expected output and the tests fail.
Is there a way we can edit the registry so that processes are run with GetACP() returning 1252?
Thanks
Adam Skwersky

Answer 1

Hi,
GetACP() returns a value which indicates what your current codepage is. For the UTF-8 codepage, this returns 65001, if the system's locale is set to English United Kingdom (for example), GetACP will return 1252.
Maybe you can try to change the system’s locale and rebooting and check if it works.
Here are some docs about how to change the system’s locale and the Code Page Identifiers for Windows ANSI:
https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-international-core-winpe-systemlocale
https://learn.microsoft.com/en-us/windows/win32/intl/code-page-identifiers

Thanks for your time!
Best Regards,
Mico Mi

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