Does this work?
https://sourceforge.net/projects/blogexporter/
Not yet:
2008-08-03 19:27:13,968 DEBUG [BlogExporter.Core.PostParser] Parsing blog 4855217953238557838, post 4841212145285365256: Welcome.
2008-08-03 19:27:13,984 ERROR [BlogExporter.Console.Program] Error while exporting blog
BlogExporter.Core.ExportException: Value not not found: atom:content/text()
at BlogExporter.Core.XPathResolver.GetValue(XPathNavigator node, String xpath, String defaultValue) in H:\Development\Blog\BlogExporter\BlogExporter.Core\XPathResolver.cs:line 55
at BlogExporter.Core.PostParser.ParsePost(XPathNavigator blogPost) in H:\Development\Blog\BlogExporter\BlogExporter.Core\PostParser.cs:line 186