File Activation in Windows Store app in C#? -

I am trying to create a Metro Media Player, but I have a problem with file activation, that is, when I use MP3 from Windows Explorer Open the file, it opens my app, but no, I can not get the argument, how can I get the file or name in the text block for which my app has been launched, I saw many ways in different websites , but I can not solve it,

There is really good explanation on how to do it:

You can get the filename and the size of the file is here:

  Protected Override Zero Onfile Active (FileActivivorAg RGR Algus) {// TODO: File Activation Handle / Received Files The number is args.Files.Size / the first file is Args.files [0] .name}