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Editorial Team
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Asked: 2026-05-15T07:11:00+00:00

I am trying to implement a filesystem browser using the WindowsAPICodePack for C# (.Net

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I am trying to implement a filesystem browser using the WindowsAPICodePack for C# (.Net 4), and it works pretty well, except that the ShellObject system treats zip files as folders, whereas I’d prefer they be files. Is there some way I can force it to work this way? The low-level interop it does is beyond me.

As far as I can tell, internally it asks if the item is a Folder or a Filesystem element. It then uses this (and some type checks) to figure out what it actually is. Is it safe to force it to treat it as a file if it’s Compressed? Or do I have to do something else?

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1 Answer

  1. Editorial Team

    Ok, well first, I saw that there was a flag in ShellNativeMethods.SFGAO called SFGAO_COMPRESSED. This doesn’t seem to actually appear ever though, maybe it was deprecated?

    Failing that, I eventually just cheated and did the following in ShellObjectFactory.cs:

    Below:

    // Is this item a Folder?
bool isFolder = (sfgao & ShellNativeMethods.SFGAO.SFGAO_FOLDER) != 0;

    I added:

    // Is this a compressed Folder?
bool isCompressedFolder = (itemType == ".zip");

    And then I replaced

    else if (isFolder)

    with

    else if (isFolder && !isCompressedFolder)

    This is a total hack, but it seems to work, so unless someone has a better idea I’m sticking with this. Hopefully it’ll help someone else out in the future, posts on the WindowsAPICodePack seem pretty rare.

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