The main problem is that some files are missing. You need to find in the project folder a file with *.mechdb extension and follow the next steps: – After finding the *.mechdb file, duplicate this folder and change this file extension to *.mechdat – Open workbench and upload this file: File –> Import–> .mechdat – open the box with the geometry/mesh and export the mesh to a known extension. (*.msh is you want to open Fluent) Open a new project or add a new box with Fluent to work with the retrieved mesh.