I don't have a Mac so I'll have to make an assumption that Excel 2004 for the Mac is equivalent to Excel 2003 for Windows ... which is "limited" to 65336 rows.
You may be able to download the file (not into Excel) and then use an Excel Viewer. Or, for Windows, there are converters.
I suspect that you may need to upgrade.
Have you tried Google Docs? That might be able to open it for you.
Regards, TMS
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