Hi Big_Bird ! This configuration is saved in a user.config file on the client's machine in:

C:\Users\[user]\AppData\Local\Microsoft_Corporation\FullTrustSandbox(Excel-DN_Path_tkrehcb3zj0cqoyjgeeoo0qtmbgbwh0x\16.0.12730.20270

The last folder in the file path is a version number that coincides with the version of Office/Excel that is installed on the machine. The user should only have to set this once, unless they are changing the historian to which they are connecting to or changing how they want to connect.