Hello again Robert!
After so much effort, I finally got to do this. The problem is that Advpcb.dll file is somehow damaged, so I have no chance uninstall Altium or import DXF/DWG files unless I Format my HDD. But not everything is lost. You can create the board shape using STEP file. For that you should do this: (under the title "Define From 3D Body"
http://techdocs.altium.com/display/A...ard+Shape))_ADThen, for the Outline, draw the ouline in a mechanical layer manually and for the curve lines in your design you can use "Ctrl+Space" keys. Now you have your board outline but it will not appear in the Gerber files. To do so, you have to select the mechanical layer you used to draw the outline, select all the lines you draw and then go to "Design->Board Shape->Create Primitives from Board Shape". Create the primitives in a mechanical layer, and make sure nothing else is in that layer.
Then, You should be using an OutJob to create the Gerbers. Right click the "Gerbers" line, select config, go to the "layers" tab, and check the mechanical layer containing your outline.
And that's it. You have your PCB shape the way you need and the outline printed in the gerber files.
I hope this can solve a lot of questions out there.