Common file formats used to compose and performance chiptunes are the SID, YM, SNDH, MOD, XM, hardly any Adlib based file formats and numerous extrinsic Amiga file formats.
In the last couple of years, chip music has returned to late gaming, either in full chip hymn style or using chip samples in the music. Contender that do this in their soundtrack include Mega http://www.voice-express.com/ Man Action Network, Seiklus, and Tetris DS.