Primary interop assemblies (PIAs) for Microsoft Excel
Computer workstations must have the PIAs installed and registered in the global assembly cache to run Office solutions that target .NET Framework.
You can install the complete set of PIAs in the global assembly cache in two ways:
- Modify the Microsoft Office
If you did not install .NET Framework before you installed the Office system, the PIAs are not installed with your Office installation. If you installed .NET Framework after you installed the Office system, you can install the PIAs by modifying the Office setup.
- Install them from the redistributable PIA package.
The Microsoft Office PIAs are installed in the global assembly cache in drive:/WINDOWS/assembly or drive:/WINNT/assembly.