What is .UST file extension?
File created by UTAU, a vocal synthesizer similar to YAMAHA's VOCALOID and VOCALOID2 software; supports musical notes as well as dynamics, vibrato, pitch, and lyrics; often used for storing music for Japanese vocaloids, which are virtual characters used by sing and dance games.
UST files can be played back in the UTAU, and they can be exported to MIDI (.MID) or VOCALOID (.VSQ) formats or rendered to a .WAV file. UTAU can also import VSQ and MIDI files and convert them to UST files.
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.