Notes about the 31 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The 31 file type is primarily associated with 'PHASES'. PHASES is a package of computer programs designed to compute phase angles for diffraction data from macromolecular crystals. The programs are written in FORTRAN 77 with the exception of a single C interface subroutine (facilitating use of X-Window graphics in some programs) and are applicable to any space group without requiring changes by the user. The program package was written by W. Furey, VA Medical Center and University of Pittsburgh, Dept. of Crystallography. Documentation dates from 1997.