问题
I have created a custom add-in for Excel and for the most this work fine without any issues.
However, we have a 3rd party application where we can select the option to "Open In Excel". This then loads a new instance of Microsoft Excel with a load of data populated from the application, but does not load the custom add-in.
If I go in to the add-ins option, I can see that Excel still seems to think that the add-in is enabled but I can see that it is not because the macros are not imported to workbook.
I can disable and then re-enable the add-in and it will work just fine. I can also open an Excel document or a new instance manually and it will work as expected. It only ever seems to be an issue when the instance of Excel is opened from this 3rd party application.
I assume that this is because the add-in is bound to my account and the process is being started by another account even though task manager sees it as being a process ran by myself.
If anyone has any ideas as to why this is happening or how to resolve it, I would be very grateful to hear.
来源：https://stackoverflow.com/questions/32076150/excel-custom-add-in-not-loading-when-instance-of-excel-is-opened-by-another-appl