The launch function is "ONLY" designed for launching multimedia files like video & audio. Not for launching programs which potentially may have viruses & worms, etc.
Open the file outside of LW. ie: For fast & easy access, go to your LW Library window, select Saved Files folder & press the Explore button. Sample image here:
Using Library Explore button to access downld folder (click on link) & the folder will open up for you. Then deal with it from there.