I am trying to send the results of a stored procedure as a csv file. I can get everything to work EXCEPT the file is being sent it UNICODE. How do I send a file in ASCII?

Code:
exec master.dbo.xp_sendmail @recipients = 'youngp'
                          , @query = 'ap_GetLiborRates @LastObsDate = ''02-MAy-2003'''
                          , @attachments = 'Rates.csv'
                          , @subject = 'Libor Rates'
                          , @attach_results = 'True'
                          , @separator = ','
                          , @width = 1000
                          , @dbuse = 'Development'
Thanks!