C# Signature:

[DllImport("shell32.dll")]
static extern int SHGetFolderPath(IntPtr hwndOwner, int nFolder, IntPtr hToken,
   uint dwFlags, [Out] StringBuilder pszPath);

VB.Net Signature:

    <DllImport("shell32.dll")> _
    Private Shared Function SHGetFolderPath(ByVal hwndOwner As IntPtr, ByVal nFolder As Int32, ByVal hToken As IntPtr, ByVal dwFlags As Int32, ByVal pszPath As StringBuilder) As Int32
    End Function

User-Defined Types:

    Private Const CSIDL_WINDOWS As Integer = &H24

Sample Code:

    Dim winPath As New StringBuilder(300)
    If SHGetFolderPath(Nothing, CSIDL_WINDOWS, Nothing, 0, winPath) <> 0 Then
        Throw New ApplicationException("Can't get window's directory")
    End If
    Console.WriteLine(winPath.ToString)

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