QuickBooks Company File Can’t Open? Try These Quick Fixes A corrupted file, improper file extensions, insufficient user permissions, or an application conflict could be the cause of your QuickBooks company file not opening. Try renaming the.ND and.TLG files, running QuickBooks File Doctor, checking file location and permissions, or starting QuickBooks in admin mode to fix issue. Reinstalling QuickBooks or restoring a backup might be required if the issue continues.If you experience any problems, call the QB support team at 1.855.738.2784. URL :https://accountinghelplineus.mystrikingly.com/blog/conquer-quickbooks-company-file-can-t-open-nd-and-tlg-files-are-damaged