Horizontal squishing of photos????

I have a folder with a lot of photos, some bmp, and some jpg, and Photoshop CS somehow distorts some of these so that they are about 70% narrower than they should be. I took one in particular to test, it was a jpg, and it appeared in its correct aspect ratio when viewed with Internet Explorer, Picture Publisher, and Thumbs Plus, but, Photoshop CS skewed the aspect ratio so that the image was about 70% narrower. Why is this? I used Thumbs Plus to convert the jpg to bmp, and then viewed this bmp rendering in photoshop which still presented it with the skewed aspect ratio. What is going on here? How does photoshop determine the correct aspect ration for an image? Why is it different from all the other photo viewers?
Confused, littleberry

I found the answer myself. It is under Image>aspect ratio, and select Square pixels. Photoshop offers many pixel aspect ratios, and the wrong one was set (I wonder how?). Anyway, no need to reply. littleberry

I found the answer myself. It is under Image>aspect ratio, and select Square pixels. Photoshop offers many pixel aspect ratios, and the wrong one was set (I wonder how?). Anyway, no need to reply. littleberry