[Bug 59041] New: Incorrect Casting for NET 10 Runtime Apps

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59041

Bug ID: 59041
           Summary: Incorrect Casting for NET 10 Runtime Apps
           Product: Wine
           Version: 10.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 79808
  --> http://bugs.winehq.org/attachment.cgi?id=79808
Backtrace and terminal output

Upon upgrading some of my NET 9 Desktop Runtime WPF applications to NET 10,
Wine now has different behavior with Ookii Dialogs.

A very simple application was built to easily reproduce this bug
https://github.com/dreamsyntax/net10-bug-ookii-wine-repro

I have also attached an identical program but built with NET 9 to demonstrate
the proper behavior.

Tested on Wine 10.19 (staging, dev and stable all tested on Debian Trixie as of
2025-11-24). I also tested on Arch linux on Wine 10.19 stable, which is where
my attachments are ran on.

Reproduce steps
1. Make a brand new wine prefix
2. Install required .NET Desktop Runtime x64 (10.0.0 for bug repro)
If testing NET 10 version (one with bug) - install:
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop...

If testing NET 9 version - install:
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop...

3. Run the test application (NET10WineBugReproduceWPF.exe)
4. Click the single button available in the UI
5. Wine will crash on NET 10 version; without ever having shown the file
picker. Will not crash on NET 9 version.

6. On Windows and NET 9 versions, the FilePicker will appear, and upon choosing
an EXE it will pop a messagebox with the filepath chosen.

NET10-BUILD--net10-bug-ookii-wine-repro.zip
sha256:474949597616a1dc14cb3f03d91570fdc7ff9d425d872f50f3a40fd3a0a5f3c3

NET9-BUILD--net10-bug-ookii-wine-repro.zip
sha256:c4c1c7ce33856c64df1157ad38f29da6e4222b4f33a6ed2a20bc4de4a556c2f2

[Bug 59041] Incorrect Casting for NET 10 Runtime Apps

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59041

dreamsyntax  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal

[Bug 59041] Incorrect Casting for NET 10 Runtime Apps

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59041

--- Comment #1 from Nikolay Sivov  ---
Please try this one, maybe it's enough
https://gitlab.winehq.org/wine/wine/-/merge_requests/9591

[Bug 59041] Incorrect Casting for NET 10 Runtime Apps

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59041

Louis Lenders  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |download
                 CC|                            |[e-mail]
     Ever confirmed|0                           |1
          Component|-unknown                    |comdlg32

--- Comment #2 from Louis Lenders  ---
(In reply to Nikolay Sivov from comment #1)
> Please try this one, maybe it's enough
> https://gitlab.winehq.org/wine/wine/-/merge_requests/9591

Hi, I gave this patch a try and the patch seems to fix this bug. The app
behaves now as described by OP.

Note: I had to disable icu.dll and icuuc.dll otherwise I get crash below.
Hopefully this will be fixed before code freeze:

I wine: Call from 00006FFFFFBED887 to unimplemented function
icu.dll.ulocdata_getCLDRVersion, aborting
wine: Call from 00006FFFFFBED887 to unimplemented function
icu.dll.uloc_canonicalize, aborting