Some file is missing from single-file self-contained publish beginning in .NET 5.0.3

[gcaughey]

• .NET Core Version: 5.0.3

• Have you experienced this same bug with .NET Framework?: No

Problem description:

Application fails to launch with this message: Launch exception: The system cannot find the file specified. (0x80070002)
This only happens with a a single-file self-contained app published to a folder on a PC that doesn't have .NET 5 runtime installed.
If the app is published self-contained but not single-file, the app runs as expected.

This appears to only happen in a winforms app. I have not seen this behavior in WPF apps.

Expected behavior: It should run when published single-file self-contained as it did with previous versions of .NET 5, which did not have this issue,

Minimal repro:

[RussKie]

This sounds like a duplicate of #4397 (which is a duplicate of dotnet/runtime#40103).
Please have a look in it to see if it is.

Please check EventViewer for stack traces and other relevant information for more insights.

[gcaughey]

There is nothing in EventViewer. I can't say for sure if this is the same issue, but even if not, it could have a common cause.

[gcaughey]

This behavior is new for me beginning in .NET 5.0.3, so that would be different from those other issues, which occurred in earlier versions of NET 5.

[RussKie]

Can you please provide a small repro so we can investigate further?

[gcaughey]

I'm still working on a small repro, but I was able to get something from the EventViewer with a different app that also fails to launch:

Faulting application name: WasteworksSyncManager.exe, version: 2.0.0.0, time stamp: 0x600b9ea2
Faulting module name: KERNELBASE.dll, version: 10.0.18362.1316, time stamp: 0x7a6bfa05
Exception code: 0xe0434352
Fault offset: 0x001146d2
Faulting process id: 0x57d4
Faulting application start time: 0x01d70c4982551974
Faulting application path: C:\ProgramData\WasteWORKS-SQL\WWSync\WasteworksSyncManager.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 9a41ca88-60d0-4108-a758-47ad99da08ef
Faulting package full name:
Faulting package-relative application ID:

Application: WasteworksSyncManager.exe
CoreCLR Version: 5.0.321.7212
.NET Version: 5.0.3
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException: The system cannot find the file specified. (0x80070002)
at System.Reflection.RuntimeModule.GetFullyQualifiedName()
at System.Reflection.RuntimeModule.get_Name()
at System.Windows.Forms.Application.EnableVisualStyles()
at WasteWorks.Program.Main(String[] args)

[gcaughey]

TestWinformsPublish.zip

Repro steps:

1. File, new Winforms project targeting .NET 5
2. Build
3. Publish to folder selecting Release/x86 single-file self-contained
4. Try to run from a PC that doesn't have .NET 5 installed
5. Check EventViewer for errors. I got this:

Application: TestWinformsPublish.exe
CoreCLR Version: 5.0.321.7212
.NET Version: 5.0.3
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException: The system cannot find the file specified. (0x80070002)
at System.Reflection.RuntimeModule.GetFullyQualifiedName()
at System.Reflection.RuntimeModule.get_Name()
at System.Windows.Forms.Application.EnableVisualStyles()
at TestWinformsPublish.Program.Main()

Faulting application name: TestWinformsPublish.exe, version: 1.0.0.0, time stamp: 0x600b9ea2
Faulting module name: KERNELBASE.dll, version: 10.0.21322.1000, time stamp: 0x7cfb5e08
Exception code: 0xe0434352
Fault offset: 0x0013a212
Faulting process id: 0x1a38
Faulting application start time: 0x01d70c5159c87272
Faulting application path: Z:\TestPublish\TestWinformsPublish.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: bace5034-309a-48cc-8fc0-6e491f83d188
Faulting package full name:
Faulting package-relative application ID:

[gcaughey]

I found that if I commented out this line in program.cs, the app loads ok:
//Application.EnableVisualStyles();

[RussKie]

Duplicate of #4397