Windows Forms: Extract the Icon Associated with a File in C#

Drag the ListView and ImageList controls from the visual toolbox to your winform.

You should set the LargeImageList property of ListView control to the ImageList.

Add code to handle form load event as shown below.

private void Form1_Load(object sender, EventArgs e)
{
    using (ManagementObjectSearcher managementObjectSearcher = new ManagementObjectSearcher("select ProcessId, Name, ExecutablePath from Win32_Process"))
    {
        using (var results = managementObjectSearcher.Get())
        {
            var processes = results.Cast<ManagementObject>().Select(p => new
            {
                ProcessId = (UInt32)p["ProcessId"],
                Name = (string)p["Name"],
                ExecutablePath = (string)p["ExecutablePath"]
            });
            foreach (var pro in processes)
            {
                if (System.IO.File.Exists(pro.ExecutablePath))
                {
                    var icon = Icon.ExtractAssociatedIcon(pro.ExecutablePath);
                    var key = pro.ProcessId.ToString();
                    this.imageList1.Images.Add(key, icon.ToBitmap());
                    this.listView1.Items.Add(pro.Name, key);
                }
            }
        }
    }
}

You need to add a reference to the System.Management.dll, and don't forget to import the namespace below.

using System.Management;

Press F5 to run your project, we will get all process, then extract the icon associated with the process.