.OMG

.OMG file extension

This is the basic program to work with .OMG extension

SonicStage

SonicStage ATRAC files

SonicStage allows you to import music from a variety of sources such as audio CDs, online music services, and your computer's hard disk. Your music files are registered as tracks in "My Library," the SonicStage music database. Tracks within My Library can be managed in various ways... (more)

The program works with the following extensions: mp3, wma, mp4, wav, 3gp, m4a, oma, aa3, omg, xdmd, oml2 and oms2

.OMG extension is also supported by the following programs:

O&O DiskImage

O&O DiskImage O&O DiskImage Backup Container

Back up and restore data, entire partitions or just their parts.
OpenMG Jukebox

OpenMG Jukebox Open MG File

This utility will resolve some issues concerning OMG files and many others.