Do you know a free filepicker?

Hi everyone, I'm creating an audio player and I would like to know: do you know any FREE extension to search and select files from the device and from the SD card? Thanks in advance!

Have you looked at https://puravidaapps.com/file.php by Taifun? Look at the Jukebox article and use the stock ListPicker to select the track rather than randomly.
This might work for you.

Regards,
Steve