AcTools.Utils.FileUtils.GetOriginalFilename C# (CSharp) Method

        public static string GetOriginalFilename(string filename) {
            var directory = Path.GetDirectoryName(filename);
            var name = Path.GetFileName(filename);
            if (directory == null) return filename;
            return Directory.GetFiles(directory, name).FirstOrDefault() ??
                    Directory.GetDirectories(directory, name).FirstOrDefault() ?? filename;
        }