Hi Troy,
in the end I used a VBA macro in the Excel sheet to put the "last edited by" author into a cell of my worksheet when saving the workbook…
But as we ("our department") change all Excel files from XLS to XLSX/XLSM/XLSB I may use your approach the next time I need such a feature!
Best regards,
GerdW

using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019