Hi Tony,
Thanks for posting in the community.
We would love to help you with your query, however, our team has limited resources to rebuild a similar environment to test it on our end directly. I hope you understand that in this case it is difficult for us to answer your questions without testing. Since your query is related to using the same .dic file for multiple users on a network drive, I recommend you post a new thread in the Microsoft Q&A Community there for expert help and confirmation. You can click "Ask a question" and add the tags Office Managementand Windowsin the Tags field when posting a new thread.
Also, we welcome community members to share ideas about the situation if one has related experiences.
Appreciate your understanding and patience. 😊
Sincerely,
George | Microsoft Community Moderator