I would like to be able to modify it and especially to have the guidelines, finally the curve that passes in the center so that I can calculate the angles etc. Would you know how to do it?
Because when I click on edit function, it asks me to open another file that I don't have
I attach the file while specifying that it does not belong to me but I assume that putting it on a site like grabcad shows a desire to disseminate.
Because of the simplicity of the part, you can create a 3D sketch by snapping it to the centers of the circles that should appear at the junction of the different segments.
At worst you save it in STEP and then you re-open it with featurworks to recognize the functions and you can modify it as you want. I propose this as you are missing a file. In this way, Featurworks will rebuild the entire part with all functions and sketches.