Launch an external file NOT in the external_files folder Storyline 360

Hello,

I need a button to launch a very large video file when clicked. It will play in Media Player, outside of the project. Clients in multiple offices have an identically mapped local link to the file location that allows it to stream without loading the entire thing. When I publish my Storyline project, it copies the video to the external_files folder, I don't want that. How do I get the button to launch the file from the original file location and not from the external_files folder?

Ben