If QuickBooks won’t open company file then you need to check whether you are using the latest version of QuickBooks or not. For that, you need to visit the official website and download the update. If you already have the latest version then you can rename the TLG and ND files for your company files and then try to open it. You can do it by following these steps: · Open file explorer and then search for the folder where you have saved the company file · Look for the TLG and ND files that have the same name as your company file · Right click on any of them and rename it · Once you are done, open the QuickBooks and your company file too