Dear Donn Strain,
Good day to you!
I hope you are doing well. Thanks for reaching out to our Microsoft Community Forum. We will be happy to help you.
Based on your initial question, it seems you want to use VSSX files in Visio. To do this, I suggest opening the Visio app, then clicking on the View tab. Next, select Page Width for a better layout. On the left side, click More Shapes, then choose Open Stencil. This will allow you to browse and select the location of the VSSX file you want to open.
If you encounter any errors during this process, please share a screenshot of the error for further assistance.
If my understanding is incorrect, please correct me and provide more details, and we will assist you further.
I would like to share that my first response may not resolve your current situation immediately. However, with your help and some more specific detailed information, we can work together to find a specific direction for your current situation.
I am looking forward to your response for further assistance.
Thank you for your understanding. Your cooperation and contributions are greatly appreciated.
Kind Regards,
Nahid Sultan