On .NET Framework you can use System.Windows.Forms.OpenFileDialog for open files with the native Windows UI but that only works on Windows.
There is a System.Windows.Forms.OpenFileDialog implementation for .Net Core or another alternative?
Since .NET Core added support for Windows desktop applications, WPF and Windows Forms applications that target .NET Core can use the OpenFileDialog
and SaveFileDialog
APIs exactly the same way as they would do in the .NET Framework.
These APIs have been ported to the Windows specific desktop packs that sit on top of .NET Core 3 and later.