Error: -6073, -99001. QuickBooks is unable to open this company file


Why this is happening

This error may occur for one of the following reasons:

  • The file is open in Single User mode on the machine hosting the file.
  • The file is still being accessed by another workstation and is in Single User mode.
  • The file is located in a read-only network folder.
  • The files are hosted on a Linux server and are using more than one set of login credentials to sign on to the shared folder.
  • The file was being accessed by remote software (LogMeIn, GoToMyPc, etc.) and the host computer still sees that user as actively logged on.

How to fix it

Errors that occur while setting up or working in Multi-User mode can be time-consuming to diagnose and correct. To help investigate and resolve the error, we recommend using the QuickBooks File Doctor, which analyzes whether your computer and network connection are set up properly for Multi-User mode.

Solution: Download, install and run the QuickBooks File Doctor.  It is designed to troubleshoot networking and multi-user errors that can occur when you open a company file.

If the tool is unable to detect a problem or is unable to repair the problem, you can return to this article and try the other solutions described here.

If the company data file is open in Single User mode on another workstation:

  1. Have all workstations close out of QuickBooks completely?
  2. Open QuickBooks on host computer.
  3. Open file and switch to Multi-User mode.
  4. If this does not work, have all workstations reboot.

If the company data file is open in Single User mode on the host computer:


For QuickBooks 2010 and higher:

  1. Select File > Close company.
  2. Select Open or restore an existing company > Open a company file (.QBW or .QBA).
  3. Click Next.
  4. Select the company file from the Company Files list.
  5. Select Open file in multi-user mode > Open.
  6. Log in as you normally do.

If the company data file is located in a read-only network folder:


  1. Go to the computer sharing out your company data file.
  2. Open Windows Explorer and navigate to the folder containing your company data file.
  3. Right-click on the folder containing your company data file, and then select Properties > Security tab.
  4. To change the permissions for an existing group or user, click the name of the group or user.
  5. Set the Allow check box for Full Control for the group or user that needs access to the QuickBooks file.

NOTE: If there is other sensitive data on the host computer you can set up a network folder specifically for storing your QuickBooks company files.

  1. Click the Apply button and then click OK.


If the computer was being accessed remotely via GoToMyPC, etc.:


  • Right-click on the task bar and select Task Manager.
  • Go to the Processes Tab.
  • Examine the processes running and see if any are shown as being in use by the disconnected remote user.
  • If the remote user is shown as the owner of any running process, Restart the computer.