Workpapers CS add in does not load in Microsoft Office applications

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Change to CS Support service hours

Our Support department is closed on Friday, April 28th for a company event. However, limited Accounting CS phone support is available on that date from 9 AM - 5 PM ET due to the approaching deadline for quarterly payroll tax forms.

Links to our most popular payroll tax processing topics are available in the Alerts and notices section on the right side of most pages.

When you open a Microsoft Excel workpaper, the Workpapers CS add-in is automatically loaded. The add-in is needed to link the workpaper to the Actions > Enter Trial Balance screen in the main application. If there is a problem with the add-in, you may experience one of the following.

Use the following steps to correct the functionality of the Workpapers CS add-in.

If you have documents that are not automatically returned to the binder, click here to view steps to recover the documents before continuing with the information below.

  • If you want to return a copy of the document that does not have your most recent changes, right-click on the workpaper and choose Discard checkout.
  • If you want to return a copy of the document that includes your most recent changes, right-click on the workpaper and choose Return to binder.

If you receive an error message when performing either step above, browse to C:\Users\[your user name]\AppData\Local\Creative Solutions\Accounting CS\CheckedOutFiles and see if there is a copy of the workpaper there. You can change the permissions to this document so it is not marked as "Read-only". Note that the AppData folder is a hidden folder by default.

  1. On the workstation, go to Control Panel and then choose Programs and Features.
  2. Click on Accounting CS or Workpapers CS and then click on Uninstall.
  3. Browse to the WinCSI folder where you installed the application.
  4. Find the Accounting CS or Workpapers CS folder inside of the WinCSI folder.
  5. Inside the DESKTOP folder, find and double-click the Setup.exe file.
  1. Close the application on your workstation.
  2. Right-click on the icon on your desktop and choose Properties.
  3. On the Compatibility tab, verify that the Run this program as an administrator checkbox is unmarked.
  1. In Microsoft Excel, click the File tab and then Options.
  2. Click the Add-Ins button on the left side.
  3. In the Manage drop-down menu, choose Excel Add-ins and then click Go...
  4. Verify that the checkbox is marked for the Cs.Accounting.Excel.Automation item.
  5. Click OK.
  6. Repeat steps 1 and 2.
  7. In the Manage drop-down menu, choose COM Add-ins and then click Go...
  8. Verify that the checkbox is marked for the CS.Accounting.OfficeIntegration.ExcelVstoAddin item.
  9. Click OK.

If you do not see the CS.Accounting.Excel.Automation or CS.Accounting.OfficeIntegration.ExcelVstoAddin items, you may need to choose Disabled Items from the Manage drop-down menu. In the dialog, click the item and then click the Enable button.

  1. In Microsoft Excel (or Word), click the File tab and then Options.
  2. Click the Trust Center button on the left side.
  3. Click the Trust Center Settings button on the bottom right.
  4. Click the Trusted Locations button on the left side.
  5. Click the Add new location button.
  6. Click the Browse button and go to C:\Program Files(x86)\Creative Solutions\Workpapers CS or Accounting CS and then click OK.
  7. Mark the Subfolders of this location are also trusted checkbox.
  8. Click OK.

PPC Trusted Location in Word

Third party addins you're not using may be conflicting with the Workpapers CS addin, causing it to become disabled. Use the following steps to disable any addins you don't need.

  1. In Microsoft Word or Excel, choose File > Options.
  2. Choose Addins on the left.
  3. At the bottom of the Addins section, choose "COM Add-ins" in the Manage field and then click Go.
  4. Clear the checkbox for any addins you're not currently using and then click OK.

Note: If you're using PPC Checkpoint Tools, be sure that you do not disable those addins.

Internal notes


With the 2015.3.0 update for ACS/WPCS, certain Microsoft components were updated and may cause a conflict with Microsoft Office 2010 and earlier. Install the updated Microsoft Visual Studio Tool, and then close and reopen Microsoft Word or Excel to resolve the addin not loading.

To look for and fix potential addin conflicts:

  1. Open the Start menu and then type "regedit" in the search to open the Registry Editor.
  2. Browse to the HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins
  3. Click on the first item in the Addins folder.
  4. Double-click LoadBehavior and then change the ValueData to 1 and click OK.
  5. Repeat steps 2-4 for the following locations as well. Note that if the first item does not have the LoadBehavior item, move down to the next item.
    HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins
    HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Excel\Addins
    HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Word\Addins
    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Excel\Addins
    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Word\Addins
    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Software\Microsoft\Office\Excel\Addins
    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Software\Microsoft\Office\Word\Addins
  6. Close the Registry Editor and reboot your computer.

Note: The following folders in the Registry Editor should remain at a LoadBehavior value 3.

  • PPCExcel12
  • PPCExcel12Repurpose
  • PPCMenu.dsrPPCMenuExcel
  • PPCOBPA.ExcelConnect
  • PPCSecurity.PPCSecurityDsr
  • CS.Accounting.OfficeIntegration.ExcelVstoAddin
  • CS.Accounting.OfficeIntegration.WordVstoAddin
  • WordEEFonts.Connect
  • AdvanceFlow.ExcelAddIn
  • cab_addin.Connect

Error message: Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass; to interface type 'Microsoft.Office.Interop.Excel._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000208D5-0000-0000-C000-000000000046}' failed due to the following error: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)).

  • To solve this error, delete this registry key (the number at the end will vary depending on which year of Office is installed - you'll want to delete the older version most likely).

Nothing happens when you try to open a document (the status changes to Checked Out but Excel/Word never opens): Check Programs and Features in the Control Panel to see if there are remnants of an earlier version of Microsoft Office. Uninstall, reboot, and then you may get a Workpapers error that says "The system cannot find the file specified." If you see this, open Excel or Word and Windows should automatically launch an installer that will do some configurations. You'll then be able to open documents from the Workpapers Dashboard.

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