What is .PHO file extension?
Audio data file used by MBROLA, a speech synthesizer used for generating speech audio in multiple languages; contains a list of phonemes, which are the basic audible units of speech, as well as the duration for each phenome; used for generating .WAV, .MP3, or other audio files with human speech.
NOTE: PHO files themselves are not playable audio files, since they only contain the data required to generate human speech audio when input into MBROLA.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.