Stretch Pixel Aspect Ratio with AME CS5?

I was given some videos that were in the wrong pixel aspect ratio. The videos are 4:3 and they were supposed to be 16:9.
Can I stretch the videos in AME? I tried to adjust the resolution, but when I hit the Output tab to preview the video, it gave me the same 4:3 video withblack bars on the sides.
(I also have Premiere Pro CS5, and if this could be done in Premiere, then I'm willing to do that. But I can't seem to be able to create a 16:9 sequence that is 320 X 180.)

In Premiere, you can right click on your footage in the Project Bin.  From the context menu, choose Modify then Interpret Footage.  In that dialog box, you can tell it to conform the pixel aspect ratio to 16:9.

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