Maximum Video enlargement size in Adobe Premier Pro CS3?

[Hitokiri Batohsai]

I was trying to enlarge a 120x80 pixel video into a 720x480 video by just clicking the side margin and noticed that I could not enlarge the pixels onto that size. I know I will get a very poor quality video output, but I wanted to do it anyway. What is the highest enlargement percentage Premier Pro can do to a native resolution video file? I did manage to enlarge the small video using WMM and I am satisfied with the result. Its a bit weird that Premier could not do this kind of function. Thank you