The Open an existing file button on the welcome screen opens the open file dialogue box, which allows you to select from any of the supported experimental file formats or either of the PoreXpert modelling file formats.
If you open a PoreXpert file you are taken to the Home screen and you see a list of completed operations and operations still to be calculated.
If you open an experimental data file you are taken to the simplex sampling screen, or
If your experimental data file is not shown in the open file dialogue box, it means that PoreXpert does not recognise the file you are trying to open as a valid experimental data file. Please look at the example data files to check that your files have the correct format - example data files can be found in the PoreXpert folder located in Your Documents.