MainForm.cs

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using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace ConvertFile
{
    public sealed partial class MainForm : Form
    {

        public MainForm()
        {
            this.AllowDrop = true;
            this.InitializeComponent();
        }

        private void MainForm_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.Copy;
        }

        private void MainForm_DragDrop(object sender, DragEventArgs e)
        {
            string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
            foreach (string file in files)
            {
                string[] importLines = File.ReadAllLines(file);

                string directory = Path.GetDirectoryName(file);
                if (directory == null)
                    continue;

                string targetPath = Path.Combine(directory,
                    $"{Path.GetFileNameWithoutExtension(file)}_out{Path.GetExtension(file)}");

                File.WriteAllLines(targetPath, importLines.Select(line => line.Replace(' ', ',')).ToArray());
            }
        }
    }
}