Sure. The Microsoft official runtime for .Net Framework was only written to work on windows, relying heavily on Windows' underlying Win32 api. It was unofficially possible to run .Net Framework code on Linux using the Mono project's Linux runtime and that was the foundation Microsoft used to create the cross-platform .Net Core.
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This is also what I think (after what I read or heard). Do you know, why .NET Framework is limited to Windows?
Sure. The Microsoft official runtime for .Net Framework was only written to work on windows, relying heavily on Windows' underlying Win32 api. It was unofficially possible to run .Net Framework code on Linux using the Mono project's Linux runtime and that was the foundation Microsoft used to create the cross-platform .Net Core.