I launched excel by calling the exe path instead of launching using the VBO, and then attaching to it using the VBO's Attach action. However, Blue Prism automatically closes the Excel instance after the process completes when running in the control room. If the process runs in debug mode, even after hitting the 'End' stage, the instance remains open. Doing a 'Reset' of the process closes the Excel instance as well - I believe it is some form of a cleanup function performed by Blue Prism after a scheduled process runs. It would be good if a Blue Prism admin can advise on this.