.PIO File Extension
File TypePro Tools I/O Settings File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is a PIO file?
Settings file created by Pro Tools, a digital audio workstation (DAW); saves input and output settings, including input sources, output formats, bus configurations, mic preamps, and H/W insert delay; allows settings to be saved and reused between sessions.