This is confusing: jprt build result on Windows contain *old* jvm.map and jvm.pdb files. Presumably they match the import JDK/JVM but are of no use in the build result.

unzip -l windows_i586_5.1-product.zip
...
   5220643 2013-06-26 10:16 jre/bin/client/jvm.diz
   3555840 2013-06-26 10:16 jre/bin/client/jvm.dll
   3424875 2013-06-20 12:14 jre/bin/client/jvm.map
  16337920 2013-06-20 12:14 jre/bin/client/jvm.pdb
      1447 2013-06-26 10:16 jre/bin/client/Xusage.txt

For files built on the 26th, the files from the 20th are stale.

The .diz file does contain the right files, and unzipping it will overwrite the old files.