What Is Microsoft.office.interop.dll & How to Download It

Some of the easiest download steps

by Afam Onyimadu
Afam Onyimadu
Afam Onyimadu
Afam is a geek and the go-to among his peers for computer solutions. He has a wealth of experience with Windows operating systems, dating back to his introduction... read more
Reviewed by Alex Serban
Alex Serban
Alex Serban
Windows Server & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
Affiliate Disclosure
  • We explore microsoft.office.interop.dll and explain its core functions regarding spreadsheets.
  • This DLL serves many functions and is especially useful for .NET developers trying to integrate other .Net apps.
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This article explores everything you need to know about Microsoft.office.interop.dll and shows you the best way to download it on your Windows computer.

Like every other DLL file, this file contains essential code or instructions for performing various processes on a computer.

Before getting into it, you may also want to refer to our guide that explores all you should do if you have missing DLL files on Windows 11.

What is Microsoft Office Interop Excel DLL?

Interaction among applications is one role that DLLs fulfill, and the Microsoft Office Interop Excel DLL serves this role as relates to the Excel application. It is a .Net file containing a set of classes and interfaces that help you use the Excel spreadsheet.

The library helps developers to read/write and perform complex manipulation of the MS spreadsheet. Some of its most important uses include the following:

  • Visualizing data – It is essential for creating visual representations in spreadsheets, such as pivot tables, graphs, and charts.
  • Analyzing data – It helps devs to read and analyze huge data from the spreadsheet with functions like filtering, sorting, and aggregation.
  • Data migration – It aids data transfer from Excel to other applications, especially for storage.
  • Automation and data integration – With the DLL, devs will perform automation for reports, and these can be integrated with other .NET programs.
  • Reporting – Devs use the DLL for report generation, a useful feature for businesses and large organizations.

Since we have established how useful this file is, let us explore how you may download it.

How do I download microsoft.office.interop.dll?

1. Using specialized DLL tools

Using specialized tools is the most recommended solution to downloading the .NET DLL file. This is because they automate the process and will be helpful if you encounter any DLL-related problems.

However, our top recommendation is to use Fortect. This is because microsoft.office.interop.dll is native to Windows OS, and the tool guarantees 100% download success for files native to the operating system. With a single click, you should be well on your way.

2. Download from dll-files.com

  1. Navigate to dll-files.com.
  2. The topmost entries are the most updated versions. Click the Download link for one matching your system architecture.
  3. Right-click on the downloaded ZIP file and select Extract All.
  4. Lastly, you can copy the extracted Microsoft.Office.Interop.Excel.dll file and add it to any program’s installation folder that needs the DLL.

3. Download with Microsoft Office 2010: Primary Interop Assemblies Redistributable

  1. Go to the Primary Interop Assemblies Redistributable download link.
  2. Save the downloaded file.
  3. Lastly, double-click PIARedist to install and follow the wizard.

The Primary Interop Assemblies Redistributable is one of Microsoft’s installer packages that contain microsoft.office.interop.dll. Once you successfully install this package, you will have the DLL installed on the article.

Any of these three solutions should work just fine, so feel free to try whichever feels the most convenient. While we encourage using some automatic DLL installer, as long as you complete the process successfully, this will not matter.

Still experiencing issues?


If the above suggestions have not solved your problem, your computer may experience more severe Windows troubles. We suggest choosing an all-in-one solution like Fortect to fix problems efficiently. After installation, just click the View&Fix button and then press Start Repair.

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