"Microsoft Office has identified a potential security concern. Warning the digital signature is valid  but he signature is from a publisher whom you have not yet chosen to trust. file path c:\F9\f9.xll. Application add-in has been disabled. Addins might contain viruses or other security hazards." when using F9 and Microsoft Excel

Entry Type: Informational

Product: F9

Application: F9

Version Reported: 4.2

Subject:

"Microsoft Office has identified a potential security concern. Warning the digital signature is valid but the signature is from a publisher whom you have not yet chosen to trust. file path c:\F9\f9.xll. Application add-in has been disabled. Addins might contain viruses or other security hazards." occurs when using F9 and Microsoft 2007 if Windows is set to Don't show hidden files and folders and Hide extensions for known file types.

Possible Resolution:

In Windows, select to show hidden files and folders and show extensions for file names.

  1. Right-click the Start button, and click Explore.
  2. On the Tools menu, click Folder Options.
  3. Click the View tab.
  4. Select the Show hidden files and folders option.
  5. Clear the Hide extensions for known file types check box.
  6. Open Microsoft Excel 2007.
  7. Click the Microsoft Office button, and then click Excel Options.
  8. Click Trust Center, and then click Trust Center Settings.
  9. Click Add-Ins, and select the Require Add-Ins to be signed by Trusted Publishers option.
  10. Close and reopen Microsoft Excel.
  11. Auto attach F9:
    1. Click the Microsoft Office button, click Excel Options.
    2. Click Add-Ins, click Manage Excel Add-ins, and then click the Go button.
    3. Browse to the ..\F9 folder, and the F9.xll file. Click OK to auto attach F9.
    4. The warning message above displays, but ends with an option to Enable all code published with this publisher. Select to enable the option, and F9 is added to the trusted publishers.
    5. If F9 is listed, review the trusted publishers.
      1. Close and reopen Microsoft Excel.
      2. Remove F9 from the auto attaching add-ins.
      3. Clear the Require Add-Ins to be signed by Trusted Publishers check box.
      4. Double-click F9.xll, and F9 attaches to Microsoft Excel 2007.