Opening/Reading "Image" dump files

My D800 took a slow boat to somewhere and is gone over the horizon. However, before it left, it did a image dump and left me some files that have the B01 File, B02 File etc, and MDT File extensions, like adsp.b01 and cmmlib.b01 with an associated cmnlib.mdt. There are about 50 or so files.

Do not know what is in them but some are pretty large, several gigs. Any way to open these files and determine what they are and if they are recoverable?

TIA