From Apache OpenOffice Wiki
The "registry" module implements the ".rdb" access library (libreg.so) as well as the tools for dealing with ".rdb" files,
- regcompare - to compare two ".rdb" files,
- regmerge - to merge one or more ".rdb" files into another ".rdb" file,
- regview - to dump the content of an ".rdb" file.
- cd registry/test/regcompare
- dmake #Upon failure dmake aborts with an error.