fix bug:Issues 下载管理在只下载音频的情况下点击打开文件夹没反应 #709

src/DownKyi/ViewModels/DownloadManager/DownloadedItem.cs

@@ -91,18 +91,24 @@ namespace DownKyi.ViewModels.DownloadManager
         private void ExecuteOpenFolderCommand()
         {
             if (DownloadBase == null) { return; }
-
+            //TODO:这里不光有mp4视频文件，也可能存在音频文件.aac这里需要将所有文件的后缀名枚举出来
-            string videoPath = $"{DownloadBase.FilePath}.mp4";
+            //fix bug:Issues #709
+            string[] fileType = new string[] {".mp4",".aac" };
+            foreach (string type in fileType)
+            {
+                string videoPath = $"{DownloadBase.FilePath}{type}";
                 FileInfo fileInfo = new FileInfo(videoPath);
                 if (File.Exists(fileInfo.FullName))
                 {
                     System.Diagnostics.Process.Start("Explorer", "/select," + fileInfo.FullName);
+                    break;
                 }
                 else
                 {
                     //eventAggregator.GetEvent<MessageEvent>().Publish("没有找到视频文件，可能被删除或移动！");
                 }
             }
+        }
 
         // 打开视频事件
         private DelegateCommand openVideoCommand;