If you have downloaded the Microsoft Excel 120 Object Library DLL from a third-party website, you may need to repack it to ensure compatibility with your system. To repack the DLL, follow these steps:

Safe and Official Ways to Resolve the Missing Object Library Error

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The actual file associated with this library is typically , not a standalone .dll file.

The specific "Office Shared Features" were not included during the initial setup.

The Microsoft Excel 120 Object Library is a component object model (COM) library that allows developers to programmatically interact with Excel from external applications. This library is crucial for creating applications that can read, write, or manipulate Excel files (.xls, .xlsx, etc.) or for automating tasks within Excel itself.

You rarely need Excel 12.0 specifically. Later versions are backward-compatible.