.ND files help QuickBooks run properly and manage your user access settings. However, a company file will not open if it's damaged, incorrect, or if the .QBW file was moved during an upgrade without moving the corresponding .ND file. I'll be happy to share some troubleshooting steps to get this sorted out and so that you can restore the company file.
First, search for *.ND in the computer containing the company files and rename it. This way, QuickBooks creates fresh versions of the file. Here's how:
Open the Windows Start menu.
Enter and select File Explorer into the Search field.
Search and open the folder that has your company file.
Find the .ND file that has the same name as your company file. They should look like this: [Your company file name].qbw.nd.
Right-click the file and select Rename.
Add the word OLD to the filename.
After that, open QuickBooks and restore your company file. This will automatically create a new .ND file.
If you get an error message when restoring the file, I've attached some links to use and resolve them: