The winners for summer MOTS are D-ead7Dog, toonanimals317, and Telluric! Congratulations!
You need a OGRE Mesh exporter. Such can be found here:http://www.pelicancrossing.com/Exporters/ExporterAC3D.htm
Hm. Then try placing the following files in your AC3D plugins folder.http://www.mediafire.com/?j7f61jzs81adl9n