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Editorial Team
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Asked: 2026-05-12T13:49:47+00:00

I am searching for a way to add several files into one file, much

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I am searching for a way to add several files into one file, much like a Zip file. I need to be able to create a file container on the fly and add several word documents, images and other important files into the container. My criteria is that you don’t need to install any additional software on the computer (preferebly only a .DLL file that i can include in my project), that the program is free and that you can encrypt the data.

Anyone know of any good container programs that has support for these 2 criterias or if anyone know any good information about how to create your own container.

Patrick

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1 Answer

  1. Editorial Team

    Does it have to be like a zip file, or can it be a zip file?

    Are you using .NET Framework 3.0 or 3.5? If so, look at
    System.IO.Packaging.ZipPackage

    This discussion has a section about it.

    In addition to DotNetZip (licensed with Microsoft Public License) that Jay Riggs mentions, there’s SharpZipLib (licensed with GPL). Whichever you choose, be sure the terms of the license match your understanding of the word “free”.

    If you can use ZipPackage, one benefit is that you don’t need to think about license terms (beyond those of developing any other .NET app).

    EDIT: DotNetZip and SharpZipLib support encryption. I don’t see that ZipPackage does, but you could look at System.IO.Packaging.EncryptedPackageEnvelope.

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