I don't know if I did something wrong, but it should works, I guess.

Now, after change the DataPath and migrate my workspace form 15.1, I tried a very simple action. Open the DataBase Explorer and DataBase Builder, to check the files. And even restoring the DataPath (including my network references) I can't open the files.

Does anybody knows if the Studio does not support it anymore?

I tried to run my project without debuging it, and it works. So, I suppose only Studio (and tools) can't open the files.