Crystallographic Information File (CIF) - is a standard text file format containing crystallographic information defined by the International Crystallography Union (IUCr).
Also, the same CIF extension is used as - an optical disk image file. Developed by Corel and used by Roxio Easy CD Creator . Programs also opening this format: Roxio Media Creator , MagicISO , IsoBuster , EZB Systems UltraISO .