How to find Windows' System directories from 32 bit EXE running on both 32 and/or 64 bit OS

I have a .NET 3.5 application written in C# which needs to copy files to *BOTH* the windows' system folders.   It has some 32 bit DLLs which need to go in the system32 folder and it has 64 bit DLLs which need to go in the 64 bit System folder.  

So, basically i need to figure out how to write these methods:

public string Get32BitWindowsSystemFolder()
{

}

public string Get64BitWindowsSystemFolder()
{

}
RXCTOAsked:
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RXCTOConnect With a Mentor Author Commented:
The enumeration for SystemX86 is not available in .NET 3.5 but appears to be only in .NET 4.  

However, researching it I came across the solution for .NET 3.5.

        private static int CSIDL_SYSTEM = 0x0025;
        private static int CSIDL_SYSTEMX86 = 0x0029;

        [DllImport("shell32.dll")]
        public static extern bool SHGetSpecialFolderPath(IntPtr hwndOwner, [Out]StringBuilder lpszPath, int nFolder, bool fCreate);

       public static string GetWindowsSystemDirectory32()
       {
           StringBuilder sb = new StringBuilder(2048);
           SHGetSpecialFolderPath(IntPtr.Zero, sb, CSIDL_SYSTEM, false);
           return sb.ToString();

       }

       public static string GetWindowsSystemDirectory64()
       {
           StringBuilder sb = new StringBuilder(2048);
           SHGetSpecialFolderPath(IntPtr.Zero, sb, CSIDL_SYSTEMX86, false);
           return sb.ToString();

       }
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David Johnson, CD, MVPOwnerCommented:
you will run into problems as you should be using the appdata folder or programdata folder as the windows directory is a protected area. There is only 1 system32 folder which contains both 32bit and 64 bit executables.
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RXCTOAuthor Commented:
My program is following the instructions to install "Java Access Bridge" from Oracle.  The instructions say to copy some of the files to the System32 folder and others to the SysWOW64 folder.  What am i supposed to do?

see Table 2-2 in the instructions.

http://docs.oracle.com/javase/accessbridge/2.0.2/setup.htm
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David Johnson, CD, MVPOwnerCommented:
actually I had misspoken earlier:
system32 contains the 64 bit dll's
syswow64 contains the 32 bit dll's

The copying routine must run with elevated privileges (run as administrator) to access these protected areas
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Jacques Bourgeois (James Burger)Connect With a Mentor PresidentCommented:
You can retrieve the location of any system folder by calling GetFolderPath with one of the folders listed in the SpecialFolder enumeration:

System.Environment.GetFolderPath(Environment.SpecialFolder.SystemX86)
System.Environment.GetFolderPath(Environment.SpecialFolder.System)

In a 32-bits environment, both of these will return the same folder.
In a 64-bits environment, System gives the system folder for 64-bits and System86 for 32-bits.
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RXCTOAuthor Commented:
The other comment only works for .NET 4.  My question specified .NET 3.5.   My solution works for .NET 3.5
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