This has been ported over from python to c# https://gist.github.com/lalinsky/8f2cd9e8f80e62c82af2 all credits goes to Lukáš Lalinský
Usage
ExtractMassiveWavetables.exe path-to-tables.dat path-to-output-directory
This will extract the content into two directories: One with the original extracted content: Original. And one where the filenames are renamed to the same used by the NI Massive GUI's Correct Waveforms.
Read here for more info: http://www.reddit.com/r/edmproduction/comments/2d2op8/massive_wavetables_list_info/
Enjoy!
Kind Regards, Per Ivar Nerseth