Script to Close and restart program

Looking for some help, I have been playing around with IFTTT's for a few tasks on one of the networks I control. With some success and some not so.

I also want part of my next one to help with an iTunes Apple TV issue.

I want to shut iTunes down on a remote pc and then restart it. I am doing this by texting IFTTT which puts a txt file in a Dropbox folder on the pc. The new script would run on a schedule that basically says if this file exists here than close iTunes wait 300 ms and restart iTunes than Del file ??

Need help with the script. Unless anyone has a faster way to remote close a program and restart it, via iPhone