The iQFeed instrument names are as follows:
AUDCAD.EFXG
AUDJPY.EFXG
AUDNZD.EFXG
AUDUSD.EFXG
CADCHF.EFXG
CADJPY.EFXG
CHFJPY.EFXG
EURAUD.EFXG
EURCAD.EFXG
EURCHF.EFXG
EURGBP.EFXG
EURJPY.EFXG
EURSEK.EFXG
EURUSD.EFXG
GBPCHF.EFXG
GBPJPY.EFXG
GBPUSD.EFXG
NZDJPY.EFXG
NZDUSD.EFXG
USDCAD.EFXG
USDCHF.EFXG
USDDKK.EFXG
USDJPY.EFXG
USDMXN.EFXG
USDNOK.EFXG
USDSEK.EFXG
EFXG = EFX Group, which was MB Trading's forex arm before they were purchased by MB Trading.