Trying to open .gpjs I've previously worked on and consistently getting the following error for multiple .gpjs "Cannot open a database created with a previous version of your application."

I've had that error after Microsoft updates, and solved it by re-installing the Microsoft Access Database engine under settings>apps

Hey thanks for the idea but that wasn't it. It's odd because the files it won't let me read are files I created. Something outside my direct doing occurred between the 2 months I created the projects and reviewed them. 

Yes, the thing that happened beyond your doing was that Microsoft automatically updated your version of the access database engine. Search this forum as there are many instances of this problem along with Bentley's recomended solution. Here us one post: https://communities.bentley.com/products/geotechnical1/w/wiki/50929/cannot-open-a-database-created-with-a-previous-version-of-your-application---august-2020

Yes, the thing that happened beyond your doing was that Microsoft automatically updated your version of the access database engine. Search this forum as there are many instances of this problem along with Bentley's recomended solution. Here us one post: https://communities.bentley.com/products/geotechnical1/w/wiki/50929/cannot-open-a-database-created-with-a-previous-version-of-your-application---august-2020