Now you can download Google Docs in new office format like docx. For some reason Google has discontinued support of old MS Office doc format in “download as” menu. However, if you want to convert Google docs to old office format like .doc, you can use “email as an attachment”. You would have to choose “attach as” for proper application.
If it is doc you should choose “attach as”, “Microsoft Word”. In mail the file that will arrive would be in old doc format.