The Invantive add-ins for Microsoft Office are loaded by Microsoft Office from a folder of their own. A workbook or document refers to the add-in by its full path, so the same file opened on another device finds the add-in only when the add-in lives in the same place there. The following environment variable controls that folder and is available on Microsoft Windows: - `INVANTIVE_CONTROL_XLAM_FOLDER`: the folder which holds the `.xlam` file of [[Invantive Control for Excel/Invantive Control for Excel|Invantive Control for Excel]]. Defaults to the add-in folder of Microsoft Office itself. A folder which does not exist is ignored, upon which the default location applies after all and a warning is logged. The variable is meant for a deployment which places the add-in centrally rather than per user, and for repairing a workbook whose references point at a folder which is not available on this device; see [[Formula Returns Not Available]].