How to add import/export entities

Hi,

I have some extra entities for import/export from http://www.ubercart.org/contrib/141. What shall I do for importexportapi to recognize these?
I have added these files to modules/importexportapi/definitions/contrib. But they are not added to the list while I´m trying to export.

Mvg,

Jurgen Agten
Gadgets & Geschenken