I can help you with resolving the error you're having when opening a company file using this user profile, @rjlane.

You can run the Quick Fix my Program from the QuickBooks Tools Hub. This tool will close any open background processes QuickBooks uses and run a quick repair on your program.

Step 1: Download and install the QuickBooks Tools Hub:

1. Close your QBDT. 
2. Download or get the latest QuickBooks Tool Hub. 
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the prompts to install and agree to the terms and conditions.
5. When the install finishes, double-click the icon on your Windows desktop to open the tool hub.

Step 2: Run the Quick Fix my Program:

1. Go to your QuickBooks Tools Hub and click the Program Problems.
2. Select Quick Fix my Program.
3. Start QuickBooks Desktop and open your data file.

If you're still having problems getting into your QuickBooks, follow the next solutions outlined in the following article: Fix issues when QuickBooks has stopped working.

You can also perform a clean install of QuickBooks Desktop so Windows can fix company file issues without affecting your data at all: Clean install QuickBooks Desktop.

If none of the provided troubleshooting steps worked for you, it'll be best to contact our Customer Support team. They can further check this user profile in a secure environment and help you resolve it.

Follow the steps below on how to reach them:

1. From your QuickBooks Desktop account, click the Help menu at the top.
2. Select QuickBooks Desktop Help.
3. Provide some information about this concern in the search box.
4. Click the Contact Us link at the bottom of the window.
5. You'll now be provided with a few support options.
6. Select Get a call to arrange a callback from a support agent. Or Start a chat to chat with them directly.

You can check this article for more information about the different types of support we offer and their availability: Contact QuickBooks Desktop support.

Let me know if there is anything else that I can help you with your opening this user profile. I'm always here ready to help. Have a wonderful day!