I have about 300,000 images in a format that will not allow the ExifTool to read the IPTC header information. If one of the images is opened in PhotoShop as a jpeg it opens fine. If you save it in PhotoShop and then run the ExifTool against it, the IPTC can be read just fine.

When I rename a file to .jpg and open it with Gimp, I get the following error:
JPEG image Message:
Not a JPEG file: starts with 0x00 0x05

These images came out of an AP Preserver system without benefit of it's front end, if that helps anyone.

Being imaging gurus, any thoughts on what the problem might be?

I have posted a sample without a file extension at:
http://www.o-day.net/sample/3951626

Thanks in advance for the help