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I have the standard RSS feed "www.domainname.com/feed/" but need
something like "www.domainname.com/rss.xml" instead. A program that
posts to FB doesn't work with non .xml rss feeds. Looked high and low on
G and B for a plugin that does it and came up with nothing. Does
anyone know how to do this?

Thanks

try http:// page2rss dot com

you can use SEO plugin to create sitemap (Wordpress)
WordPress SEO by Yoast
All in One SEO Pack
or
XML Sitemaps (Non Wordpress)

burn ur feed into feedburner to get various formats of ur feed including xml