Program.cs

using System;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using Microsoft.VisualBasic.CompilerServices;

namespace KoARImages
{
    class Program
    {
        static void Main()
        {
            //using Stream stream = File.OpenRead(Path.Join(AppDomain.CurrentDomain.BaseDirectory, "item_information_template.xml"));
            //XDocument document = XDocument.Load(stream);
            //foreach (var g in from node in document.Root.Descendants("tex")
            //                  where node.NodeType == XmlNodeType.Element
            //                  let texture = node.Attribute("texture").Value
            //                  group (XElement)node by texture into g
            //                  select g)
            //{
            //    string filePath = Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "pngs", $"{g.Key}.png");
            //    if (!File.Exists(filePath))
            //    {
            //        continue;
            //    }
            //    string targetFolder = Path.Join(AppDomain.CurrentDomain.BaseDirectory, g.Key);
            //    if (!Directory.Exists(targetFolder))
            //    {
            //        Directory.CreateDirectory(targetFolder);
            //    }
            //    using Bitmap source = (Bitmap)Image.FromFile(filePath);
            //    foreach (var element in g)
            //    {
            //        string id = (element.Attribute("id_string") ?? element.Parent.Attribute("id_string")).Value;
            //        int left = int.Parse(element.Attribute("left").Value);
            //        int top = int.Parse(element.Attribute("top").Value);
            //        int right = int.Parse(element.Attribute("right").Value);
            //        int bottom = int.Parse(element.Attribute("bottom").Value);
            //        if (left == right - 1)
            //        {
            //            Console.WriteLine(id);
            //        }
            //        else
            //        {
            //            using Bitmap clone = source.Clone(new Rectangle(left, top, right - left, bottom - top), source.PixelFormat);
            //            clone.Save(Path.Join(targetFolder, $"{id}.png"));
            //        }
            //    }
            //}

            for (int i = 0; i < 2; i++)
            {
                string key = "ui_icons_inv_weapons_common" + (i == 0 ? "" : "_02");
                using Bitmap source = (Bitmap)Image.FromFile(Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "pngs", key + ".png"));
                string targetFolder = Path.Join(AppDomain.CurrentDomain.BaseDirectory, key);
                if (!Directory.Exists(targetFolder))
                {
                    Directory.CreateDirectory(targetFolder);
                }
                for (int left = 0; left < 512; left += 64)
                {
                    for (int top = 0; top < 512; top += 64)
                    {
                        using Bitmap clone = source.Clone(new Rectangle(left, top, 64, 64), source.PixelFormat);
                                   clone.Save(Path.Join(targetFolder, $"{left/64 }_{top/64}.png"));
                    }
                }
            }
        }
    }
}