Mapping information that describes the mapping of referenced projects to their container project is included in the container project, using a “module mapping” file. A module mapping file is a simple meta-data file, for use at development time only, which stores data that maps relative URIs to IDE project names. The module mapping file contains entries for the location of nested archives, relative to the virtual archive defined by the container project, mapped to the uniquely named referenced project within the IDE. The paths of the archive files are computed “on the fly” just before the application server is started, rather than being simply written into an extensions file, located within the container project, in a fixed form when the enterprise application is written/developed.