[Bug 52223] New: activeCodePage utf-8 in application manifest not respected

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52223

            Bug ID: 52223
           Summary: activeCodePage utf-8 in application manifest not
                    respected
           Product: Wine
           Version: 6.22
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: fusion
          Assignee: wine-bugs at winehq.org
          Reporter: terinjokes at gmail.com
      Distribution: ---

Starting[1] with Windows 1903 (Windows 10 May 2019 update), Windows has allowed
applications to opt-in to supporting the UTF-8 code page by defining
"activeCodePage" in their application manifest. When in this mode, the "ANSI"
-A WinAPI functions operate in UTF-8 mode.

  <activeCodePage
xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>

WINE, even when winver is set to "win10", does not respect this application
manifest key, resulting in the application starting with a legacy code page.

This can cause issues if the user expects to work with files or strings not
supported in the active legacy code page. Often characters that cannot be
represented in the code page are replaced by question marks.

I am using the staging release of 6.22.

[1]:
https://docs.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page

Expectation:

When an application with activeCodePage set to "UTF-8" in the application
manifest calls GetACP(), the number 65001 (CP_UTF8) is returned. Strings
returned by WinAPI functions (eg, file paths) are encoded in UTF-8. Strings
provided to WinAPI functions are UTF-8 and display appropriately in the UI.

Observed:

GetACP() returned a number representing a legacy code page (eg, 1252). Strings
returned by WinAPI functions are in that code page. Characters that cannot be
represented are replaced by question marks.

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