For CFF format, the alternative to the “Data file quantities” is the “CFF Post” format, which is more flexible since any combination of zones and variables can be chosen. The “CFF Post” files can be exported through : File>Export>Solution Data menu, selecting “Common Fluids Format – Post” as file type To use “Data file quantities”, the legacy “*.gz” format needs to be selected, either by tui command: file/cff-files? no, either from the File>Preferences>General panel, option : “Default format for I/O”