in the settings of what ever program your useing should be a list of aspect ratio's, like 3/2 or 2/3 4/5 etc.. maybe even onthe save fuction there will be save as settings...
your camera takes in one aspect or another, mines 2/3 i think, if i save, veiw or convert to say wide screen ratio everthings gets stretched left and right.
some thing like veiw options, screen size or some such wording.