cf javaee_platform-6_0-fr-spec.pdf EE.8.2.1:

Only JAR format files or directories containing class files or resources to be loaded directly by a standard class loader should be the target of a Class-Path reference; such files are always named with a .jar extension. Top level JAR files that are processed by a deployment tool should not contain Class-Path entries; such entries would, by definition, reference other files external to the deployment unit. A deployment tool is not required to process such external references.
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So there should be no Class-Path header, and if there is it should only have .jar files in it.