Inside Google Sitemaps: More information on the new "unsupported file format" error for Sitemaps
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As we told you a couple of days ago, we've recently enhanced the infrastructure that processes Sitemaps. We've begun processing Sitemaps against stricter guidelines because we are committed to interoperability with other tools that are using this protocol. Because of this, some of you now see an "unsupported file format" error for Sitemaps that previously had an "OK" status.
You'll see this error if the parser doesn't recognize a valid Sitemap file. Here are a few things to check if you see this error:
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