In addition to samtregar's excellent advice, i invite you to look at (jeffa) Re: Error invoking Excel through cgi for some tips on downloading Excel spreadsheets directly from the web browser.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)