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Editorial Team
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Asked: 2026-05-25T17:12:51+00:00

I want to set a file to be writeable by all users. FileSecurity sec

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I want to set a file to be writeable by all users.

FileSecurity sec = File.GetAccessControl(fileName);

string users = ?????;
sec.AddAccessRule(new FileSystemAccessRule(
        users,
        FileSystemRights.Write, 
        AccessControlType.Allow));

File.SetAccessControl(fileName, sec);

The problem is that I don’t know which string to use. I have tried users = WindowsAccountType.Normal.ToString(), but that only gives "Normal", which doesn’t work. How can I get the string that designates the group of all users on a machine?

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1 Answer

  1. Editorial Team

    I assume you are looking for the “Everyone” group which all logged-on users belong to. However using the string “Everyone” will get you into serious trouble on non-english systems

    A much better solution is to use it via SecurityIdentifier WellKnownSidType.WorldSid:

    SecurityIdentifier everyone = new SecurityIdentifier(WellKnownSidType.WorldSid, null);

    The complete solution is already described in this answer: Add "Everyone" privilege to folder using C#.NET

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