When I throw a jpg with a jgw (or jpgw) world file into Pro, they locate correctly when thrown into a map, but the program can never recognize the coordinate system, it always says no coordiate system defined. I'm trying to understand more fully what goes on when this happens. I can to use the define projection tool to fix this, it gets irritating though. Is this because the coordinate system name is not baked anywhere into the file header? The sids & tifs I get from 3rd parties all seem to have the coordinate system name baked into the header somewhere because Arc can read and tell you which coordinate system it is in, no define projection step needed. Is this because jpgs can't bake this information into their headers? What makes jpgs different than the tifs and sids in this regard?
