Media Center file types

Hello, I have an hp m8100y media center pc with windows vista ultimate installed on it. Media center, which comes with ultimate, does not recognize any of my pictures. It will see the folder that they are in, but not the pictures themselves. I am not sure, but I think it might be the fact that all of the pictures' file extensions are uppercase (.JPG). Now, help and support within ultimate informs me that it supports .jpg and .jpeg. I am wondering if the difference between uppercase (.JPG) and lowercase (.jpg) would be enough for the media center to not recognize it.

Thanks in advance. I just got a Dell Studio 17 6400T laptop with Windows Vista Home Premium, including Media Center. It is not Vista Ultimate, but has the same problem where the picture folders are recognized and named in the library, but none of the .JPG files appear. If I change them via "save as" in one of the viewers to a .bmp or .tif file they appear perfectly. Of course then they are much larger files, unnecessarily taking up extra disc space. The .jpg files appear just fine in Media Player, Photo Gallery, other viewers or photo shop type applications. I too would like to get a fix for the Media Center issue.