[Bug 51306] New: Wine-Mono doesn't show Japanese text (DllImport issue?).

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51306

Bug ID: 51306
           Summary: Wine-Mono doesn't show Japanese text (DllImport
                    issue?).
           Product: Wine
           Version: 6.11
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mscoree
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 70171
  --> https://bugs.winehq.org/attachment.cgi?id=70171
source and executable.

I wrote and ran a short program attached with Wine 6.11 and Wine Mono 6.20.
But, it didn't work as expected.
The code calls kernel32's GetDateFormatA by DllImport feature.
I guess Wine-Mono's DllImport doesn't handle Japanese ANSI code page well.

Steps to reproduce:
1. If your 'locale -a' doesn't show ja_JP.utf8, add Japanese locale support to
your environment. 
2. Run today.exe on Japanese locale with wine,
   i.e. LANG=ja_JP.UTF-8 wine today.exe

Expected result:
   Message window shows today's date text in Japanese, e.g. 2021年6月21日.

Actual result:
   Message window appears, but shows no message text.

Remarks:
   If we use CharSet.Unicode instead, it works properly.