SVG to EMF export -- control file size

I have a SVG file with a file size of 236 KB. When exporting it to PDF (with default options) it looks fine and the resulting PDF is even reduced in size to 90 KB. Exporting to EMF however, yields a file with size > 150 MB, which is bigger than expected and bigger than usable for me (I need to use the vector graphic in MS Word 2010 which, sadly, does not support SVG).

I couldn't find any options to control the file size. Is there a way or can someone point me to the reason the file size explodes? The SVG file is attached.