Hello John,
You can find some examples in the online documentation:
Word/Excel export (HTML-based)
In fact you can set your own number format in the same way as you set the custom formats in
Excel.
Best regards,
Daniel
the Telerik team
Consider using RadControls for ASP.NET AJAX (built on top of the ASP.NET AJAX framework) as a replacement for the Telerik ASP.NET Classic controls, See the product support lifecycle here.