Dropout,
Did you ever get this resolved?
It’s been a while since v2.1, so please forgive a failing memory. Within Composer, from the Open or Import dialog box, is there a “RTP – Gerber ArtPath File” option in the Files of Type: listing? If so, that should do it. If you do have that option and for what ever reason it’s not placing the vectors within Composer, you may want to open the file in ArtPath, select all (or select only what you desire to have in composer), “copy” to the clipboard, then “paste” to your document in Composer.