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Microsoft.Office.Interop.Excel.dll

Updated: Files Available: 24
Verified Metadata AI Analysis x86 (32 bit) x86-64 (64 bit)

Download and install Microsoft.Office.Interop.Excel.dll to fix missing or corrupted DLL errors.

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DLL Overview

Last Updated
Dec 24th, 2025
Filename
Microsoft.Office.Interop.Excel.dll
Company
Microsoft Corporation
Product
Microsoft Office 2010
Description
Microsoft.Office.Interop.Excel
Architecture
x86 (32 bit) x86-64 (64 bit)
Metadata Consensus
6/24 Files 25%
Higher percentages indicate stronger agreement across versions. View available versions or browse repository metadata to compare differences between variants.

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About Microsoft.Office.Interop.Excel.dll

Microsoft.Office.Interop.Excel.dll is a DLL file (Dynamic Link Library) used by Windows programs to share code and resources. It allows multiple applications to use the same functions, improving performance and reducing redundancy.

AI-assisted overview · Dec 12, 2025

Overview

What Is Microsoft.Office.Interop.Excel.dll?

Microsoft.Office.Interop.Excel.dll is the primary .NET interop assembly used to automate and interact with Microsoft Excel from .NET applications. It provides the COM-based bridge that allows software to open Excel, create spreadsheets, modify cells, run formulas, and control the Excel application programmatically.

  • Filename: Microsoft.Office.Interop.Excel.dll
  • Company: Microsoft Corporation
  • Product: Microsoft Office
  • Description: Microsoft.Office.Interop.Excel

This DLL is part of the Microsoft Office Primary Interop Assemblies (PIAs) and is installed with Microsoft Office or the Office developer tools.

What Microsoft.Office.Interop.Excel.dll Does

This assembly exposes the full Excel object model to .NET, enabling applications to:

  • Launch Excel or connect to an existing instance
  • Create, open, and modify .xlsx, .xls, and other Excel formats
  • Manipulate worksheets, ranges, charts, formulas, cells, and tables
  • Automate tasks such as imports, exports, calculations, and reporting
  • Access Excel COM objects in a strongly typed manner

Any .NET application that automates Excel through Office COM requires this DLL.

Where This DLL Is Located

Typical install paths include:

C:/Program Files/Microsoft Office/root/Office16/PIA/...
C:/Windows/assembly/
<application>/bin/  (if copied locally for deployment)

Exact paths vary depending on Office version (Office 2010, 2013, 2016, 2019, 2021, Microsoft 365).

Common Error Messages

When this interop assembly is missing or mismatched, applications may show:

Could not load file or assembly 'Microsoft.Office.Interop.Excel'

The type initializer for Excel.Application threw an exception

Excel Interop not registered or unavailable

These occur when the required Office COM components are not installed or registered.

How to Fix Microsoft.Office.Interop.Excel.dll Issues

1. Install or repair Microsoft Office

Excel automation requires a full Excel installation. Repairing or reinstalling Office ensures the COM components and PIAs are correctly registered.

2. Match the application's architecture (x86 vs. x64)

Excel Interop depends on matching COM architecture:

  • 32-bit Office → application must run as 32-bit
  • 64-bit Office → application must run as 64-bit

Mismatched architectures cause immediate load failures.

3. Include the DLL in the application's /bin folder (if required)

Some deployments include the interop assembly locally. If restoring manually, ensure:

  • The DLL version matches the Office version installed

4. Check antivirus or system cleanup tools

If Office components were removed or quarantined, repairing Office restores all required interop files.

Summary

Microsoft.Office.Interop.Excel.dll is the official .NET interop assembly that enables applications to automate Microsoft Excel through the Office COM interface. It is required for any program that programmatically interacts with Excel spreadsheets. Most issues are resolved by repairing Microsoft Office, ensuring correct architecture alignment, or restoring the DLL alongside the application when appropriate.

File information is supported by Human Assisted Artificial Intelligence and should be used as a helpful tool. However, it is important to keep in mind that this information may not be up-to-date or entirely accurate.

Troubleshooting DLL Errors

Most errors involving Microsoft.Office.Interop.Excel.dll occur because the DLL is missing, corrupted, or outdated. In many cases, reinstalling the related application or replacing the DLL resolves the issue. The steps below cover the most common and reliable ways to fix these errors.

Windows DLL Error Examples

This application has failed to start because Microsoft.Office.Interop.Excel.dll was not found. Re-installing the application may fix this problem.
Microsoft.Office.Interop.Excel.dll Not Found.

Fixes and Solutions

The first step in resolving DLL errors is to completely uninstall the affected software and reinstall its latest version. We know this does not always solve the problem, which is why DLLme exists. If reinstalling the application does not help, or if you are unsure which app is causing the error, follow the steps below. These are the most common solutions for fixing Microsoft.Office.Interop.Excel.dll errors.

  • Repair Windows: Make sure Windows is fully updated, then open Windows Terminal or PowerShell as an administrator (search for “PowerShell” in the Start menu, right-click it, and choose “Run as administrator”). This allows you to repair the Windows component store and run the System File Checker (SFC).

    Repair the Windows component store so SFC can pull clean files:

    DISM /Online /Cleanup-Image /RestoreHealth

    Scan all protected system files and automatically repair problems:

    sfc /scannow
  • Uninstall & Reinstall: On this DLL page, check the Company/Product section to identify the related app, then fully uninstall it. If you plan to continue using it, reinstall the latest version. Be sure to save or back up any important data before uninstalling. Windows or antivirus software may sometimes quarantine DLL files, especially if the DLL is unfamiliar or appears suspicious. Check your antivirus quarantine or logs to determine if this is the cause of your issue.
  • Download the DLL: Download the latest 32-bit or 64-bit version of the DLL directly from our repository using the download button above. Most users will need the 64-bit version, but if you are unsure, or if a 64-bit version is not available, you can install both the 32-bit and 64-bit DLLs. DLLme verifies DLLs that come from our admins, partners, and trusted affiliates. User-uploaded files may be verified later if a trusted source is confirmed.
  • Register the DLL: Most DLL files do not need registration, but some DLLs are COM components and must be registered to work correctly. If registration is required, open Windows Terminal or PowerShell as an administrator.

    Register the DLL (you can also drag the DLL file into the window to automatically fill in its full path): 

    regsvr32 "C:\path\to\Microsoft.Office.Interop.Excel.dll"

    If you are registering a 32-bit DLL on 64-bit Windows, use the 32-bit RegSvr32: 

    C:\Windows\SysWOW64\regsvr32 "C:\path\to\Microsoft.Office.Interop.Excel.dll"

    Or open Windows Terminal/PowerShell in the DLL’s folder and run: 

    regsvr32 Microsoft.Office.Interop.Excel.dll

How to Install Microsoft.Office.Interop.Excel.dll

To install Microsoft.Office.Interop.Excel.dll, place the DLL file in the appropriate Windows system folder or in the same folder as the application’s .exe file. If you are not sure which version (32-bit or 64-bit) to use, you can safely install both.

On 64-bit versions of Windows, place 64-bit DLL files in:

C:\Windows\System32\Microsoft.Office.Interop.Excel.dll

Place 32-bit DLL files in:

C:\Windows\SysWOW64\Microsoft.Office.Interop.Excel.dll

Or place the DLL file next to the application’s .exe:

C:\path\to\exe\Microsoft.Office.Interop.Excel.dll

DLL Metadata

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  1. 64 Bit
  2. Microsoft.Office.Interop.Excel.dll /64bit
  3. Microsoft.Office.Interop.Excel.dll
  4. microsoft.office.interop.excel version=14.0.0.0
  5. version 16
  6. Excel 2007
  7. microsoft office / 2016
  8. 14.0.0
  9. visual studio
  10. 15.0.4795.1001
  11. and 4 others…

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