Hi, Charles,
I got some answer for you.
This is the Metabuild Deployment Framework version. Metabuild is what lets you create installers that have other NI installers inside of them (adding DAQ drivers to a LV installer or TS installer, etc...). Since we are always making improvements to it, different products ship with different versions of MDF. If you installed a new product, you may end up with a new version of the MDF.
I hope this answers your question.
Song D
Regards,
Song Du
Systems Software
National Instruments R&D