Thanks for doing this and I am sorry to give you some issues. I, too, have tried to open an Excel 97-2003 compatiible file and the many of the cells containing numbers are odd.

Just as a guide, the list may not be complete:
Cells formatted as Date: OK
Cells formatted as Text and containing Text: OK
Cells formatted as Text and containing Numbers: Scientific Notation
Cells Formatted as Currency: All shown as Zeros
Cells Formatted as Numbers: All shown as Zeros
Cells Formatted as General and containing Numbers: Scientific notation.

Also the Full Screen and Increase/Decrease magnification buttons don't work.
Full screen can be selected by the Magnifying Glass symbol.

i hope this helps and let me know if I can test any other observations for you.