Oracle ATG Web Commerce Content Administration provides a set of TypeMapping components for the default content item descriptors in the PublishingFileRepository, and a PublishingTypeMapper component that defines this array of TypeMapping components. These components are located in:

<ATG10dir>/Publishing/base/config/atg/epub/file/typemappers

You can configure additional TypeMapping components by extending the PublishingFileRepository to support additional content item descriptors (see the section Configure Support for Other File Assets in the ATG Content Administration Programming Guide).