This is a good job for ImageMagick. I haven't used it to convert from PDF, or to convert to CGM/EMF/WMF. However, both such conversions are supported.
I think it should be as simple as: $ convert myimage.pdf myimage.wmf --B -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]