Nikon Transfer v 1.x corrupts files in a way that makes them unreadable to Adobe software, but not unreadable to Nikon software. The Nikon Transfer function that is now built-into the ViewNX2 software should work ok, although you probably want to make sure that ViewNX2 is updated to the latest version to be sure.
For existing D800 files you’ve already transferred, you can correct this corruption with the utility from the following website:
http://owl.phy.queensu.ca/~phil/exiftool/fix_corrupted_nef.html