Need script to convert jpg images to img format?

Need script to convert jpg images to img format. Using absurd Italian software that requires it. Thought the following would work but does not. Any ideas?

[CODE]
file = 'C:\my documents\my pictures';
extension = '*.jpg';
chemin = fullfile(file,extension);
list = dir(chemin);

for n = 1:numel(list)

info = imfinfo(fullfile(file,list(n).name),extension(end-2:end));
Nom = info.Filename;
img = imread(fullfile(file,list(n).name),extension(end-2:end));

hold on
figure;
imshow(img);
img2 = [Nom(1:end-4) '.img'];
imwrite(img,img2);
hold off

end
[CODE]

THANKS!

Is this the file format you're referring to (http://en.wikipedia.org/wiki/IMG_(file_format))?

Also, it would be helpful if you told us what language your script is in.