Hyperlink to file from Report

Hey guys

Is it possible to create a hyperlink to a file on a server/computer. (Nav 2015)

I know there are Properties on a Text Box with Action. I have tried to locate the file that way but it didnt work.
Not working (using "Go to URL"): \\fileserver\folder1\folder2\filename.extension
Working with Http address (using "Go to URL"): http://forum.mibuso.com

Cheers