foreach (var file in fileArray) {

    //    Console.WriteLine(file);

        string sub = file.Substring(49,file.Length - 49);
        using (StreamWriter sw = File.AppendText(folder + ".tfcs"))
        {
            sw.WriteLine(sub);
        }
        indexfiles++;
        Console.Clear();
        Console.WriteLine("Scanning Folder:");
        Console.WriteLine(folder);
        Console.WriteLine("Filesfound:" + fileArray.Length);
        Console.WriteLine("Fileswritten to Database:" + indexfiles);
        }

}

using (var writer = File.AppendText(folder + ".tfcs"))
{
    foreach (var file in fileArray)
    {
        writer.WriteLine(file.Substring(49, file.Length - 49));
        indexFiles++;
    }
}
Console.Clear();
Console.WriteLine("Scanning Folder:");
Console.WriteLine(folder);
Console.WriteLine("Files found:" + fileArray.Length);
Console.WriteLine("Files written to Database:" + indexFiles);