The Measurement Hardware Driver Development Kit (MHDDK)  has been updated to include support for X Series DAQ devices and is now available for download. The MHDDK provides development tools and a register-level programming (RLP) interface for NI data acquisition hardware for writing a custom device driver.
Included in the update:
The MHDDK is a licensed source distribution. You must read and accept the license agreement  before downloading documentation or source code.
 NI MHDDK Product Page
 NI MHDDK readme
 NI MHDDK License Agreement and Download
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Principal Software Engineer :: Configuration Based Software
Senior Software Engineer :: Multifunction Instruments Applications Group (until May 2018)
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)