How to send all selected files to media player?

I have created a button to run my media player, but when I select multiple files and press the button, only the last file in the list loads. What could I do so that all the selected files are loaded and not just the last one? Thank you!

cd "C:\Program Files (x86)\JetAudio"
@async:"C:\Program Files (x86)\JetAudio\JetAudio.exe" {allfilepath} 

That will depend on the audio player and how its command line works.

If Jet Audio's command line is documented somewhere, it should tell you what it needs. Otherwise, you might need to ask the developers.

I understood Leo, thank you very much, I will try to document myself more with JetAudio.