Chemistry file format used by HyperChem, a molecular modeling program; contains multiple records of atoms, atom properties, and bonds; also stores information about the Viewer's Coordinate System, which is referenced by the program when opening the file to restore the previous view of the molecular system.

The HIN file is used to store one or more molecular or atom blocks that contain information such as the name or description of the molecule, description of residue in a molecule, name of the atom, and the atom type assigned by a force field.