What is the solution for resolving the "Could not load file or assembly" Exception in Microsoft.Office.Interop.Excel .net Standard?

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Verify that Microsoft Office is installed on the machine where the application is running.

Ensure that the correct version of the Microsoft Office library is installed. If the application was built using a specific version of the library and a different version is installed on the machine, this error may occur. In such cases, the correct version of the library should be either installed or referenced in the application.

Check that the SYSTEM account has appropriate permissions to the required files and directories. The user executing the application may not have sufficient permissions to access the required files.

If the application is running on a 64-bit operating system, ensure that the application and the Microsoft Office libraries are both running in 32-bit or 64-bit mode. If they are not matching, then this error may occur.

If the above steps do not solve the issue, try reinstalling Microsoft Office or performing a repair installation of Microsoft Office using the installation media.