Technically, this library is an assembly (a Dynamic Link Library or DLL) that exposes the Excel object model to external programs. It contains the definitions for everything you see in Excel—Workbooks, Worksheets, Ranges, Charts, and Cells—allowing programming languages like VBA (Visual Basic for Applications), C#, and VB.NET to manipulate them without human intervention.
C:\Program Files (x86)\Microsoft Office\root\VFS\ProgramFilesCommonX86\Microsoft Shared\OFFICE16\MSO.DLL . How to Enable or Fix the Library in VBA
Scroll down and check the version available on the current machine (e.g., Microsoft Excel 15.0 Object Library for Office 2013). Click , then save and re-run your project. Best Practice: Switch to Late Binding
: Corresponds to Excel 2016, Excel 2019, Excel 2021, and Microsoft 365.
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