HOW we can make 3d curve like(http://grabcad.com/questions/video-tutorial-on-editing-3d-curve-and-using-sweep-feature) with autodesk inventor??
2 Answer

Here I made a video of it:
http://www.youtube.com/watch?v=ghBcybxE62E&feature=youtu.be
Ioannis Skarlatakis 8 Feb, 2014 11:17 AM I agree with Kreuzritter the process is pretty much straight forward as per the example
Este tutorial é de grampo de fixação de trilhos. Foi criado com linha em ambiente 3D. Espero ajudá-lo.
This tutorial is fastening clip rails. Was created with 3D online environment. I hope help you.
Sandeep Kumar 7 Apr, 2016 10:18 AM which software used to open .ipt files.