Word 365 not loading VSTO installed per-machine, but loads if installed per-user (not checking HKLM registry keys, only HKCU) RRS feed

  • Question

  • Hello,

    I am developing an add-in for Word 365 and am running into an issue when attempting to install the add-in to the machine. The installer was created with WiX toolset and places the proper registry keys in both:

    • HKCU\Software\Microsoft\Office\Word\Addins\[Add-in Name]
    • HKLM\Software\Microsoft\Office\Word\Addins\[Add-in Name]

    The user with the registry keys installed in their HKCU hive is able to access the add-in, however other users who log into the machine are not able to, despite the registry keys in the HKLM hive. From additional testing, it does not look like Word is even attempting to access the keys in HKLM. This is not an issue with Word 2016.

    Has anyone encountered this issue before? Was there a change in the way Word/Office 365 handles per-machine installs of VSTO add-ins?

    Thank you.

    Tuesday, January 28, 2020 3:48 PM