修改

XHWK.WKTool/XHMicroLessonSystemWindow.xaml.cs

             {
                 try
                 {
-                    bool isName = ModifyPathName(pageData.menuList[Subscript].FileGuid, pageData.menuList[Subscript].VideoName, out string Errmessage);
+                    string newName = pageData.menuList[Subscript].VideoName + pageData.menuList[Subscript].VideoType;
+                    bool isName = ModifyPathName(pageData.menuList[Subscript].FileGuid, newName, out string Errmessage);
                     if (!isName)
                     {
                         MessageWindow.Show(Errmessage);