Quartets of atoms defining rotation around bonds.
Use a utility like WinRAR or 7-Zip to extract the .psf file from the archive. psf.rar
Ensure you also have a corresponding coordinate file ( .pdb or .dcd ). Quartets of atoms defining rotation around bonds
If the archive fails to open, ensure it was downloaded completely, as RAR files support error recovery records but may still be unreadable if severely truncated. ensure it was downloaded completely