WOC 2008 Middle Distance Area Map 1

This is one of the two maps downloadable from the Czech O map server covering terrain within the area embargoed for the Middle qualifier/final/reserve. It's a JPEG and opens fine in Microsoft Windows and Fax Viewer and Paint but some other programs (IrfanView and OCAD 8 that I've tried so far) find something objectionable about the header information. Whatever the problem is seems to survive saving to other formats out of Paint. Anyone got any idea how to turn this into something usable by more software programs?