Hi Colin

Have you tried to detach/delete the database using MS SQL Management Studio?

To Delete a DB: 

Right-click on the specific BD and select Delete 

To Detach a DB:

Kind Regards

Bennie 

If the Database Management Console is giving you trouble and reporting a missing file (rbRTL1926.bpl), let's explore other options.
You can attempt detaching the database using SQL commands directly, which might work smoothly for you.

On another note, having a good understanding of database design principles can be beneficial in managing and working with databases effectively. If you need further assistance or have more questions, feel free to ask. Our community is here to help and support each other. Wishing you a successful database management journey!

Thanks for the additional advice, Eddy!