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how to change file permissions in a .NET 4.0 Setup project

Hello Experts,

I have a setup projects that installs a winForms applications on the users machine. The user has an option to save some defaults in the .config file for the application, but when they try it throws "Access to the path is denied." When I look the folder is "Read".  I can change this manually, but that still doesn't fix the issue. How can I assign the appropriate permissions during my installation to let user update the .config file?
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MDKDevelopers
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MDKDevelopers
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MikeQcCommented:
It's probably because your application is installed under the "Program Files" folder.
Application settings should normally be changed only by administrators.
By default, regular users does not have access to "Program Files" and his children.

So, that said, if you want to give access to only a specific file in read/write for everyone, you should use this code in your installer:

            string filename = @"C:\Program Files\Your App Folder\Your App.exe.config";  // <-- Change with the correct .config file
            // This will retreive the "Everyone" string depending of your OS version
            SecurityIdentifier sid = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
            NTAccount acct = sid.Translate(typeof(NTAccount)) as NTAccount;
            string strEveryoneAccount = acct.ToString();
            // Get the current Access Control settings for your file
            FileSecurity filesec = File.GetAccessControl(filename);
            // Add "Everyone" with the "Modify" right
            filesec.AddAccessRule(new FileSystemAccessRule(strEveryoneAccount, FileSystemRights.Modify, AccessControlType.Allow));
            File.SetAccessControl(filename, filesec);

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MikeQcCommented:
-> By default, regular users does not have access to "Program Files" and his children.

I mean does not have "modification" access to "Program Files"...
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MDKDevelopersAuthor Commented:
I did not get to try out the solution because we opted to go with Click Once deployment. I want to award you the pionts since I believe it's only fair to do so.
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