Hi Coniah,
Unfortunately at the moment we don't have documentation about the new DIAdem file format TDM. Currently we are working on the application interface (API) for C++ and the documentation like you know it from the DAT files. Both will not be finished before November. If you are interested in the API or documentation please send an email (in the beginning of November) direct addressed to me. My email is walter.rick@ni.com.
But in general, because of compatibility to the DIAdem DAT file format there is no problem to use it.
Best regards
Walter Rick