How to enable Simulink Multibody Plugin.

I have searched the documentation page for instructions for enabling the plugin. In the procedure, it is given that you need to add a code on protk.dat file. I have tried this. But the problem is I have found so many protk.dat files, so unable to decide which is to opt for adding the code. Also I have tried in every file of that type by adding the code. But no use. I am using Creo 3.0 and MATLAB R2017a version. Please help me to solve my issue