The CUB file extension is most commonly associated with Gaussian Cube files, which are standard data files used in computational chemistry and molecular modeling. These files contain three-dimensional grid data representing volumetric properties of molecules, such as electron density, electrostatic potential, and orbitals. The format typically begins with comment lines, followed by the atomic coordinates and the dimensions and origin of the volumetric grid, ending with a multidimensional array of numerical values corresponding to the grid points. Additionally, the CUB extension is sometimes used by video games, such as RollerCoaster Tycoon 3, to store scenario or game data, and by various GIS or mapping applications for elevation or satellite data. However, its primary scientific use remains in quantum chemistry software for visualizing molecular structures and properties.