Hey Lihui,
These files install with the Unix/Solaris driver that can be purchased on-line at the following links.
http://sine.ni.com/apps/we/nioc.vp?cid=1943〈=US
http://digital.ni.com/softlib.nsf/websearch/7DF09987E09E372F86256DD500004715?opendocument&node=132060_US
The examples and file information is also located in the user manual.
http://www.ni.com/pdf/manuals/323726a.pdf
http://www.ni.com/pdf/manuals/321381b.pdf
I hope this helps out.
JoshuaP
National Instruments