Multi site setup can't find sitemap.xml

I have benefited from this module over the past few years, and I am grateful for your support.

I used the Devi version to get around the having one site (sub-site) clobber the other, Google has indexed 4600 pages, the rest of the engines only 950. In trying to find out why I went through the registration and verification process with yahoo, ms live, extra. They reported that they can't find the sitemap.xml page.

When I got to admin/xmlsitemap there is a link showing me were it is, when I click on it it shows the correct content. but when I enter in the URL example.com/sitemap.xml it's not found. When I look for it with ftp it's not there either?

Can you tell me were it is so that I may make it available to the other engines.

Thanks for a great module

Regards
Ron