An ND file is a network data file which exists when the QuickBooks is accessing the company file in a multi user or network mode. Even if the user was working on the multi-user platform previously and now it uses single user then also a ND file would be present in QuickBooks. This file exists and generated with the company file only and is captured by .ND extension. Quickbooks ND file error occurs when for accessing the company file in a multi user. If you want to solve the issue follow the steps above or call the Quickbooks experts on =1-844-313-4857 and they will help you solve the error.