A fan read out the source code seen in Nagato's typing scene, and compiled it.
source
http://blog.proj.jp/ituki/data/2006/20060615.SimInject.org.cc
http://blog.proj.jp/ituki/data/2006/20060615.SimInject.cc (minor fix)
compiled file
http://blog.proj.jp/ituki/data/2006/20060615.SimInject.exe
Wow... It worked...