Are those bars hard coded into the movie, or a result of you resizing the window?
If you open the file using MediaInfo it will tell us the dimensions it was encoded with.
Codec ID/Hint : XviD
Bit rate : 526 Kbps
Width : 640 pixels
Height : 272 pixels
Display aspect ratio : 2.35:1
I'm not sure if that top screenshot was taken at the original size, but if it was you should see one of the following numbers in the Media Info output.
608pixels if the bars are hard coded and 435 pixels if they're not hard coded (Or there abouts, they were rough measurements.
Q