Export Aperture Custom Metadata

Hi,
I've got a big problem today.
I've got hundred of photos in my Aperture Library. I've added for all the photos, new Metadata (Others, then New Custom Metadata). These metadatas are very important, and I can't loose them.
Now, I've included a Portfolio Server in my workflow, and, I really need to get all my Custom Metadatas in Portfolio! As you can understand, it must be something easy and fast to do. It will not be 2 photos per day, but 50 to 200 photos a day, and I'm sure it can increase!
So, it must be automatic, and fast, and fully functional.

So, I've tried every export possible to get these metadatas, but nothing! They all disappeared!

Photoshop/Bridge are not able to read these Custom Metadatas! And it is the same for Portfolio!
So, is there a plugin to do so (picture (version or master) in a folder (all included in picture, or picture + XMP file)? If there is one, I can import, after something in portfolio (via FolderScripting?)

Thanks,
Tucpasquic

Message was edited by: Tucpasquic