As far as i know, the movie player doesn't use paths.
When you open one of the PLA files, the movie player addon looks for movies in the same folder, and with the same name. It then plays them on order based on the number at the end of the filename.
Josh Osborne - Central Innovation
HP Zbook Studio G4 - Windows 10 Pro, Intel i7 7820HQ, 32Gb RAM, Quadro M1200