iTunes + Automator bizzarely turned a blank mp3 into an m4a recording of its own title read aloud

Background: So I'm new to the Apple Automator app, and I was trying to make a script that would open iTunes in the morning (Calendar Alert) and play an iTunes radio station for 30 minutes, then shut down.

I put the station on an iTunes playlist, but Automator wouldn't play the playlist unless there was an audio file on it. I googled "blank audio file" and downloaded .10 seconds of silence from this website: http://ift.tt/1g2BB7K

This solved the problem and my alarm worked for a couple of days.

----The problem----

This morning I had my laptop closed, and when I opened it (after the time the alarm would have gone off) it took a few minutes to connect to wifi.

My Automator script opened iTunes, but instead of playing my radio station, it played the words "Point one zero seconds" over and over again in a robotic male voice. ".10 seconds" was the original title of the blank audio file I had downloaded (I had renamed it "Silence" earlier), and that blank, .10 second long mp3 has now been permanently transformed into a 2-second m4a of the words "Point one zero seconds," and I have no idea why.

Any idea what's going on here?