Preparation to switch to xml for InfinityQS export

Adaptation/FileHandlers/pcl/Convert.cs

@@ -75,6 +75,7 @@ internal class Convert
         string[] txtFiles = Directory.GetFiles(sourcePath, $"{sourceFileNameWithoutExtension}_*.txt", SearchOption.TopDirectoryOnly);
         if (txtFiles.Length != 0)
         {
+            txtFiles = (from l in txtFiles orderby l.Length, l select l).ToArray();
             foreach (string txtFile in txtFiles)
             {
                 sourceFiles.Add(txtFile);