[Bug 58752] New: assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

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WineHQ Bugzilla

5 Oct 2025 5 Oct '25

1:48 p.m.

http://bugs.winehq.org/show_bug.cgi?id=58752

Bug ID: 58752 Summary: assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\m ono\4.5\mscorlib.dll type:DllNotFoundException Product: Framework Mono Version: 6.12.0 Hardware: x86-64 OS: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: mono Assignee: wine-bugs@winehq.org Reporter: schusr@gmail.com CC: madewokherd@gmail.com Distribution: ---

Installed a 64 bit application that uses System.Media.SoundPlayer. When starting the application fails with DllNotFoundException but the file is present on the system.

dir Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll Volume in drive Z is fedora Volume Serial Number is 4979-a18d

Directory of Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5

08/28/2025 07:00 PM 4,677,632 mscorlib.dll 1 file 4,677,632 bytes 0 directories 486,067,679,232 bytes free

Running wine from Fedora 42

002c:fixme:winediag:loader_init wine-staging 10.15 is a testing version containing experimental patches. 002c:fixme:winediag:loader_init Please mention your exact version when filing bug reports on winehq.org.

rpm -qa | grep mono-core mono-core-6.12.0-19.fc42.x86_64

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WineHQ Bugzilla

6 Oct 6 Oct

5:13 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

Esme Povirk madewokherd@gmail.com changed:

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WineHQ Bugzilla

5:18 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #1 from Esme Povirk madewokherd@gmail.com --- What is the exact error message you're getting?

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WineHQ Bugzilla

5:25 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #2 from Randy schusr@gmail.com --- assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

Is the message

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WineHQ Bugzilla

7:33 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #3 from Esme Povirk madewokherd@gmail.com --- Can you get a log with MONO_LOG_LEVEL=debug

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WineHQ Bugzilla

7 Oct 7 Oct

12:35 a.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #4 from Randy schusr@gmail.com --- Created attachment 79398 --> http://bugs.winehq.org/attachment.cgi?id=79398 Debug log

Look right before this.

ERROR] FATAL UNHANDLED EXCEPTION: System.ComponentModel.Win32Exception (0x80004005): Error creating window handle.

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WineHQ Bugzilla

5 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #5 from Esme Povirk madewokherd@gmail.com --- [ERROR] FATAL UNHANDLED EXCEPTION: System.ComponentModel.Win32Exception (0x80004005): Error creating window handle.

That seems bad. Are you running without a display?

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WineHQ Bugzilla

6:02 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #6 from Randy schusr@gmail.com --- No display is working okay.

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WineHQ Bugzilla

7:28 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #7 from Randy schusr@gmail.com --- Debug log shows a totally different error than the first one I encountered. Display is working find.

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WineHQ Bugzilla

7:49 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #8 from Randy schusr@gmail.com --- Created attachment 79403 --> http://bugs.winehq.org/attachment.cgi?id=79403 non debug log

This is contains the original error, totally different from the debug log error.

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WineHQ Bugzilla

8 Oct 8 Oct

4:38 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #9 from Esme Povirk madewokherd@gmail.com --- OK. It's odd that that variable would change the behavior. Here's another one we can try: WINE_MONO_TRACE=E:System.DllNotFoundException

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WineHQ Bugzilla

9:48 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #10 from Randy schusr@gmail.com --- Created attachment 79416 --> http://bugs.winehq.org/attachment.cgi?id=79416 WINE_MONO_TRACE=E:System.DllNotFoundException

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WineHQ Bugzilla

9:48 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #11 from Randy schusr@gmail.com --- Back to the original error again.

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WineHQ Bugzilla

9 Oct 9 Oct

9:33 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #12 from Esme Povirk madewokherd@gmail.com --- Alright, some new information.

[0000000000000128:] EXCEPTION handling: System.DllNotFoundException: winbrand.dll assembly:<unknown assembly> type:<unknown type> member:(null)

"<unnamed thread>" tid=0000000000000128 this=0000000003870130 , thread handle : 00000000009bd290, state : not waiting at (wrapper managed-to-native) BardMediaManager.SendCrashInfoDlg.BrandingFormatString (string) [0x00000] in <ed0466b3e8ce4113a170f675d10afc42>:0 at BardMediaManager.SendCrashInfoDlg.getReportBody (string) [0x0002c] in <ed0466b3e8ce4113a170f675d10afc42>:0

Looks like winbrand.dll ships with Windows, and the Windows version has that BrandingFormatString function. But, this is being called by a "SendCrashInfoDlg" class in the program, so it's probably only happening because something else went wrong earlier.

Most of the other exceptions look like they're probably benign to me, except for the NullReferenceException. Which we get a stack trace of at the end. Since we're on Windows, it's probably the attempt to access win32_player here: https://gitlab.winehq.org/mono/mono/-/blob/main/mcs/class/System/System.Medi...

I would guess that either things are happening out of order (application is supposed to call Play before Stop), or calling Stop without Play is perfectly valid and we should fix the code to account for that.

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WineHQ Bugzilla

9:36 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #13 from Esme Povirk madewokherd@gmail.com --- Quick manual testing on Windows shows that calling Stop without Play doesn't throw an exception, so that should be an easy fix.

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WineHQ Bugzilla

11:14 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #14 from Esme Povirk madewokherd@gmail.com --- Made a Merge Request to Mono: https://gitlab.winehq.org/mono/mono/-/merge_requests/158

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WineHQ Bugzilla

10 Oct 10 Oct

7:31 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #15 from Esme Povirk madewokherd@gmail.com --- Also sent an MR implementing BrandingFormatString, which might have made the crash handling work properly and made this bug less confusing: https://gitlab.winehq.org/wine/wine/-/merge_requests/9159

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WineHQ Bugzilla

13 Oct 13 Oct

9:14 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #16 from Randy schusr@gmail.com --- Thanks, how do I test it?

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WineHQ Bugzilla

14 Oct 14 Oct

6:09 p.m.

New subject: [Bug 58752] assembly:Z:\usr\share\wine\mono\wine-mono-10.2.0\lib\mono\4.5\mscorlib.dll type:DllNotFoundException

http://bugs.winehq.org/show_bug.cgi?id=58752

--- Comment #17 from Esme Povirk madewokherd@gmail.com --- It'll require a current build of Wine Mono. You can do any one of these:

* Wait for the Wine Mono 10.3.0 release, which I have tagged and am working on. * Download the "make msi target" archive from https://github.com/wine-mono/wine-mono/actions/runs/18476014586 and install the MSI from it. * Download the Wine Mono source code, and build it yourself.

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