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Asked: 2026-05-27T09:41:55+00:00

I am using Microsoft.Office.Interop.Excel to read an excel file and change some cells. It

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I am using Microsoft.Office.Interop.Excel to read an excel file and change some cells. It works perfectly with xls files.

I would like to know that, if I deploy the application to the client. They have to install the whole Microsoft Office application? as I think the only dll will not work, right?

Thanks in advance.

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  1. Editorial Team

    Yes, the clients must have Office installed.
    I must add a warning, Interop is awkward you better use other (open source) libraries like NPOI or EPPlus for .xlsx- 2007 excel sheets for automation.

    Update:
    Additional to the awkward of interop, It’s unsafe when using in servers!!! see here:

    “Microsoft does not currently recommend, and does not support,
    Automation of Microsoft Office applications from any unattended,
    non-interactive client application or component (including ASP,
    ASP.NET, DCOM, and NT Services), because Office may exhibit unstable
    behavior and/or deadlock when Office is run in this environment.”

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