I'm not sure if this is your issue but could it be that Works is counting the "sheets" in the xls? I am not familiar with Works but I do know it is a scaled down version of Office.
If the spreasheet was created in Excel and has multiple sheets (tabs on the bottom), this might be your issue.
What kind of cosmic bunny hole is THT? Breast implants seem to be a moral issue.... They're BOOBS!!!