If you mean the RealSense DLL files, you can find them - in the '2016 R2' version of the RealSense SDK for Windows, at least - at this default location once that SDK has been installed on your computer:
C: > Program Files (x86) > Intel\ > RSSDK > bin > x64
I have not got the latest R3 version of the RealSense SDK installed right now but believe the library files in that version may be at:
RSSDK > core > Plugins
There is very little information on using LabVIEW with RealSense, unfortunately. I found these references:
Thank you for your reply.
But I was not able to figure it out that why Intel application engineers do not create an Add-on for Labview and why there is little information available for LabVIEW.
Generally, support for RealSense cameras by non-Intel programs is made the responsibility of the developers of those programs to provide. And the shortage of information about Labview may be a reflection of a shortage of people who have successfully used RealSense with it.