I would venture to guess that very few shop owners need or require orders to be in excel format...
So you are probably on your own obtaining this function and making it available in the admin

This could be a form of the order notification mail...but you need this in excel so a mysql export of the relavent order tables would be in order as a csv that you can then open in excel. Once you get this worked out you could then cron this to happen at some time each day...

Too bad you are with GoDaddy!!!