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It's useful to know the ModuleID for each Attributed[File] returned from externalDependencyClasspath. Mark said:
"Attributed is a typesafe heterogeneous map. It is currently only used to track the Analysis instance for an entry, but could probably be extended to associate the ModuleID and Artifact with the entry. Please open a ticket if this sounds good."
The context of this is explained in more detail in the following thread about sbt-idea:
IMPORTANT This project has moved to https://github.com/sbt/sbt. This issue still exists to avoid dead links, but GitHub limitations prevent the original issue from being correctly preserved here. Please see sbt/sbt#41 for the full issue and to comment.