Thank you for your reply darkbird, however, the last frame in my CF card is numbered 1,000 something which was taken from another display set of 20D, and the number of the first frame (immediately after that previous one) taken with MY 20D is 8,000 something.
Well, if only the VERY FIRST CF card counts, then it explains. God knows what CF card was firstly put into my 20D when she was virgin.
I tried to read the EXIF file with severial freeware but this info is locked. If only I know the Hex String corresponding to the image number!
If anyone has any software which can read this info, I'll send you the pic and please help me read.