I still wanted to do this in Visual Studio's server explorer (or any other Jet query tool). Here's what I did to fix it:
- Shift + double click the mdb file
- Go to the Database Tools tab
- Click Users and Permissions > User and Group Permissions
- If no users show up here, you may first need to visit Users and Permissions > User and Group Accounts to create one.
- Select the
Admin
user which I connect with - Under "Object Name:" click the top item, then shift click the last table to select them all
- Click all permissions check boxes (or the read-only ones, if you prefer)
- Apply; close Access.
Now Visual Studio's Server Explorer was able to connect and run queries under the "Admin" user.