Virtuadub copy and paste, help

I am using virtuadub to join two Divx avi files. I did it once with the same files few days ago but it wont work with anymore, may be I forget something.
(I did reinstalled several time)
Here what I have done, open the virtuadub, open the first file, choose the direct copy, then choose copy, then I open the second file and click paste. Here it will add paste the second file to it self ( i have two of the same file join).
What i am doing wrong here:sad:

Fire up VirtualDub> File> ‘Open Video’ choose avi1 >File> ‘Append AVI segment’ choose avi2 >File> Save segmented AVI…