gmaptool is correct with mdr file if you correct in use it. But mdr file from a ready for use img is not source info. It is result of compiling search indexes and it work property only for corresponding set of img (gmp) files. It is happened when index have appropriate address in mapset. Source for that it is raw source mdr file from mapsource installation. It is more bigger then mdr in img as you can see and it use for MapInstall and Mapsource. The most time of creating a ready for use img it is creating the result corresponding mdr for mapset as you know. The one of desired attempt is reverse engineering of mdr for whole img but it is nontrivial decision.
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