So it is 2 ways you can do this.
1. Use a text file
2. copy a URL (simple an HTTP address where the text file is)
So for the last option, I can recommend uploading the file to a dir on your website like https://www.yourwebsite.com/played/played.txt
In the APP goto HD Processor or Pass-through and then klick Streaming. In the Overview, you use the dropdown and type in the URL or pick the location of the local text file.
All the best and good luck!
//Joakim