Build for System.Windows.Forms fails in Ubuntu

• .NET Core Version: 3.1.100
• Have you experienced this same bug with .NET Framework?: No (Didn’t try, running on Ubuntu)

Problem description: I run Ubuntu18.04.3 with .NET Core 3.1.100. I use the release/3.1 branch When I try to run dotnet build from the src/System.Windows.Forms/src directory, it fails with this message,

CSC : error CS1566: Error reading resource 'System.Windows.Forms.Arrow' -- 'Could not find file '/home/areller/playground/winforms/src/System.Windows.Forms/src/Resources/System/Windows/Forms/PropertyGrid/Arrow.ico'.' [/home/areller/playground/winforms/src/System.Windows.Forms/src/System.Windows.Forms.csproj]

Actual behavior: dotnet build fails (see above)
It seems that it can’t find some resource (Arrow.ico), but this resource exists when I open it directly, and the build works on other systems (Windows and macOS).

Expected behavior: dotnet build should work
This is a screenshot of it working on macOS 10.14.6

I know that winforms doesn’t support Linux/macOS, but I want to experiment with it so I need it to build.

[areller]

@RussKie The build works now, after I’ve fixed the resources files casing. I’ll publish a PR tomorrow. Thank you for your help.

[RussKie]

I think it breaks because of the casing, the file is in the lower case: https://github.com/dotnet/winforms/tree/release/3.1/src/System.Windows.Forms/src/Resources/System/Windows/Forms/PropertyGrid

I’m not sure why it is working on the MacOS though…