What can i use when platform not supported for OpenFileDialog in C#

Hello I'm using below code to get for open file dialog but i'd like to know is there any solution to use different open file dialog can support platform.

So can anyone help me to complete catch section of below code?

   try
            {
                Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog dlg = new Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog
                {
                    ShowPlacesList = true,
                    Multiselect = false,
                    InitialDirectory = "",
                    IsFolderPicker = false,
                    AddToMostRecentlyUsedList = false,
                    EnsurePathExists = true,
                    EnsureFileExists = true,
                    EnsureValidNames = true,
                    Title = "Open Model"
                    //DefaultDirectory = ""
                    //EnsureReadOnly = false
                    //AllowNonFileSystemItems = false
            };

                dlg.Filters.Add(new Microsoft.WindowsAPICodePack.Dialogs.CommonFileDialogFilter("Text Files", "*.txt"));

                if (dlg.ShowDialog() == Microsoft.WindowsAPICodePack.Dialogs.CommonFileDialogResult.Ok)
                {
                    return dlg.FileName;
                }
            }
            catch (System.PlatformNotSupportedException)
            {
                //TODO: Support will added for not supported platforms
            }

            return null;

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