or related DLLs from third-party "DLL fixer" websites. These files are often unverified, outdated, or bundled with malware

The COM library is architecture-specific. If a developer builds a .NET application set to "Any CPU" and runs it on a machine with 32-bit Outlook installed, the Common Language Runtime (CLR) will load the 32-bit COM object. If that same application runs on a machine with 64-bit Outlook, it loads the 64-bit object.

This package makes the latest interop available through NuGet for modern frameworks.

The library is an integral part of Microsoft Office, and it must be installed through the official Office setup. Removing or replacing it can lead to system instability. Your safest and most reliable course of action is always to use the files that are part of your legitimate Office installation.

Sometimes the file exists on your drive, but Windows and Office applications cannot locate its registry entry. You can manually register the component using the Windows Registry Server.