feat: 注册右键菜单"用DrillTools打开"，新增.dr3/.trg后缀支持

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

App.xaml.cs

@@ -1,5 +1,6 @@
 using System.Configuration;
 using System.Data;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -16,6 +17,7 @@ namespace DrillTools
         {
             base.OnStartup(e);
             Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+            RegisterShellContextMenu();
 
             string? filePath = null;
             if (e.Args.Length > 0)
@@ -246,6 +248,27 @@ namespace DrillTools
             }
         }
 
+        private static void RegisterShellContextMenu()
+        {
+            try
+            {
+                string exePath = Process.GetCurrentProcess().MainModule!.FileName!;
+                string[] extensions = { ".drl", ".dr2", ".dr3", ".trg", ".dpin", ".txt" };
+                string menuText = "用DrillTools打开";
+
+                foreach (string ext in extensions)
+                {
+                    string keyPath = $@"SystemFileAssociations\{ext}\shell\{menuText}\command";
+                    using var key = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey(keyPath);
+                    key.SetValue("", $"\"{exePath}\" \"%1\"");
+                }
+            }
+            catch
+            {
+                // 非管理员权限时注册可能失败，静默忽略不影响主功能
+            }
+        }
+
         /// <summary>
         /// 验证是否为有效的钻带文件
         /// </summary>
@@ -261,7 +284,7 @@ namespace DrillTools
 
             // 检查文件扩展名是否为支持的钻带文件格式
             string extension = Path.GetExtension(filePath).ToLowerInvariant();
-            string[] supportedExtensions = { ".txt", ".drl", ".dr2", ".dpin" };
+            string[] supportedExtensions = { ".txt", ".drl", ".dr2", ".dr3", ".trg", ".dpin" };
 
             return supportedExtensions.Contains(extension);
         }