The activeCodePage manifest element can be used for more than just setting UTF-8 as the active code page - The Old New Thing

The activeCodePage manifest element can be used for more than just setting UTF-8 as the active code page Windows 10 Version 1903 introduced a new manifest property called activeCodePage, which you can use to set the process’s code page to UTF-8. Starting in Windows Server 2022 (and Windows 11),¹ you can also use this property to pick non-UTF-8 code pages in unpackaged app manifests.² AppLocale fin

[naotoj]

“If you specify an activeCodePage of Legacy, then you’re saying that your application actively hates UTF-8. It will be given the system default locale, provided a system default local exists and it isn’t UTF-8. In those exceptional cases, you get code page 1252 as a fallback”