NSYS can be used to create windows installers (not only on Windows):
http://nsis.sourceforge.net/Main_Page

We had many system which make use of NSYS configuration. On some, I got:
“Invalid command: System::Call”

Why is that? Here is the deal:
http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg72233.html

It seems, Debian has compilation issues and thus the correct version of NSYS must be made manually.

Well, in our case our unix admins/OPS did built the proper version manually and the problem was gone.