Frequently Asked Questions

Version 1 - Reviewed: January 2, 2012

Error: Could not load file or assembly Microsoft.Office.Interop.Word, Version=

The error that you get about missing interop files is usually the result of Office 2010 .Net Programmability Support not being installed. The interop assemblies are not a required component of an Office 2010 install, so they may not be installed. To install, either "Full" setup must be selected or "Custom" setup with selecting ".NET Programmability Support" for the desired products (for TariffShark, Word .Net Programmability support is needed).

There's also few ways to correct the problem after Office 2010 is installed:

  • Ask your IT Support folks to modify/reinstall your Office install and add ".NET Programmability Support"
  • Reinstall selecting the "Full" option of the Office 2010 setup
  • Download the interop assemblies from and install the downloaded .exe

You may need local administrator rights on your PC in order to take the steps outlined above.