ETI file extension is used for files that store DAB(Digital Audio Broadcasting), DAB+, or T-DMB (Terrestrial-Digital Multimedia Broadcasting) data streams. ETI files are compatible with output multiplexers.

ETI files store digital streaming data. WorldDAAB is the organization that manages standards for DAB and DAB+ formats. ETI (Ensemble Transport Interface) standard for IP (DAB) was also created by WorldDAAB.