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The UDF would be a libudf (default name) in the same folder as the case and data files. Can you ask your user to open Fluent from the Start menu? If there is no icon they need the fluent.exe file that's in nC:\Program Files\ANSYS Inc\v211\fluenttbin\win64\fluent.exenassuming they didn't do anything clever during installation. Is the file that's failing from 2021R1 or an earlier release? n