Exporting inventor so it can be read for CAM

[2544HCRC]

We built a part in Inventor and took it to a supplier so they could produce it on a CNC machine. They could not open the file in their version of Autodesk (not sure what they have). We tried 2 different file types. One was the inventor file. The other was as a dwg file. Also this shop is using version 13? Any suggestions?

Also we are looking at creating parts to be cut on a waterjet. Are we going to run into problems with inventor? We don't have much time invested in any software package and could easily switch if needed.