using System.Runtime.InteropServices;

public static uint SHGFI_ICON = 0x100;                      
public static uint SHGFI_DISPLAYNAME = 0x200;               
public static uint SHGFI_TYPENAME = 0x400;                  
public static uint SHGFI_ATTRIBUTES = 0x800;                
public static uint SHGFI_ICONLOCATION = 0x1000;             
public static uint SHGFI_EXETYPE = 0x2000;                  
public static uint SHGFI_SYSICONINDEX = 0x4000;             
public static uint SHGFI_LINKOVERLAY = 0x8000;              
public static uint SHGFI_SELECTED = 0x10000;                
public static uint SHGFI_LARGEICON = 0x0;                   
public static uint SHGFI_SMALLICON = 0x1;                   
public static uint SHGFI_OPENICON = 0x2;                    
public static uint SHGFI_SHELLICONSIZE = 0x4;               
public static uint SHGFI_PIDL = 0x8;                        
public static uint SHGFI_USEFILEATTRIBUTES = 0x10;          

public static uint FILE_ATTRIBUTE_NORMAL = 0x80;
public static uint LVM_FIRST = 0x1000;
public static uint LVM_SETIMAGELIST = LVM_FIRST + 3;
public static uint LVSIL_NORMAL = 0;
public static uint LVSIL_SMALL = 1;

[DllImport("Shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath, 
    uint dwFileAttributes, ref SHFILEINFO psfi, 
    int cbfileInfo, uint uFlags);

public struct SHFILEINFO
{
    public IntPtr hIcon;
    public int iIcon;
    public int dwAttributes;
    public string szDisplayName;
    public string szTypeName;
}

[DllImport("User32.DLL")]
public static extern int SendMessage(IntPtr hWnd,
    uint Msg, IntPtr wParam, IntPtr lParam);

public void ListViewSysImages(ListView AListView)
{
    SHFILEINFO vFileInfo = new SHFILEINFO();
    IntPtr vImageList = SHGetFileInfo("", 0, ref vFileInfo,
        Marshal.SizeOf(vFileInfo), SHGFI_SHELLICONSIZE |
        SHGFI_SYSICONINDEX | SHGFI_LARGEICON);

    SendMessage(AListView.Handle, LVM_SETIMAGELIST, (IntPtr)LVSIL_NORMAL,
        vImageList);

    vImageList = SHGetFileInfo("", 0, ref vFileInfo,
        Marshal.SizeOf(vFileInfo), SHGFI_SHELLICONSIZE |
        SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
    SendMessage(AListView.Handle, LVM_SETIMAGELIST, (IntPtr)LVSIL_SMALL,
        vImageList);
}

public int FileIconIndex(string AFileName)
{
    SHFILEINFO vFileInfo = new SHFILEINFO();
    SHGetFileInfo(AFileName, 0, ref vFileInfo,
        Marshal.SizeOf(vFileInfo), SHGFI_USEFILEATTRIBUTES | SHGFI_SYSICONINDEX);
    return vFileInfo.iIcon;
}

private void button1_Click(object sender, EventArgs e)
{
    ListViewSysImages(listView1);
    listView1.Items.Add("temp.xml", FileIconIndex(@".xml"));
}