Chip Pearson explains how to use Application.ontime (excel has to be open) here:
http://www.cpearson.com/excel/OnTime.aspx
If you don't want excel open, maybe you can find a windows scheduler that you
like--some versions of windows have one built in.
And if I were going to learn about sending a workbook via excel, I'd start with
Ron de Bruin's site:
http://www.rondebruin.nl/tips.htm
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Heck, I've never done this, but maybe you can find out how to use your
scheduling program to email the file you want and drop excel completely.