An office add-in can automatically insert a task pane into a specific file.
When a user launches an add-in that does not use any Commands the functionality is inserted into the active file.
As a result whenever the user (or a different user) opens that particular file, the task pane will be displayed automatically.

If the add-in is installed, then the task pane will open automatically.
If the add-in has been removed, then the New Office Add-in task pane will be displayed.

Removing the New Office Add-in task pane

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