You may sometimes get seemingly incorrect messages that the image files used for slogan tokens or macro tokens do not exist, even though you can actually see and open the files from within the Windows Explorer (for example file day4.tif, below).
However, whenever this problem arises, the files in question can be seen in the Windows Explorer, but their timestamp cannot be read by Windows (see above). This is usually due to a Macintosh graphics file which has not been saved under Windows. The solution is to re-open and re-save the files under Windows. The timestamp will then be visible and the problem will go away.