I just tried plugging that into a browser after installing the plugin to see if I could figure it out; I get kicked to LR but then get an error, eg:
Considering URL: lightroom://com.robcole.FileListener/Select/localhost/Users/me/Pictures/2014/2014-05-21/P 1000332.JPG
2014-06-25 13:29:20 com.robcole.FileListener ERROR ****** ERROR #6: Unable to process URL due to error: [string "FileListener.lua"]:71: Invalid select command parameters: localhost/Users/robgendreau/Pictures/2014/2014-05-21/P1000332.JPG
I derived that from the URL I copied: file://localhost/Users/me/Pictures/2014/2014-05-21/P1000332.JPG
Rob