Open Advanced X Video Converter. Click the Add Task button
on the main window.
Select Join Video Files in the Task window. Click the Next
Click the Add Files button. In the browse window, select the
files that you want to join. Press the Ctrl or Shift key, you
could select multiple files at one time.
Use the Up button and the Down button to change the order in
that they are combined. Click the Delete/Add Files button on
the toolbar or right click on the file list and select Add/Delete/Delete
All if you want to delete/add a video file.
After you have organized these video files, select an output
format. There are advanced setting in the pull-down list below.
the Save File To button to locate the output file.