PInvoke code cleanup

Client/Scripts/Util/PInvoke.cs

@@ -0,0 +1,34 @@
+global using static RageCoop.Client.PInvoke;
+using System;
+using System.ComponentModel;
+using System.Runtime.InteropServices;
+
+namespace RageCoop.Client
+{
+    internal partial class PInvoke
+    {
+        public static void ClearLastError()
+        {
+            SetLastErrorEx(0, 0);
+        }
+
+        /// <summary>
+        /// Check and throw if an error occurred during last winapi call in current thread
+        /// </summary>
+        public static void ErrorCheck32()
+        {
+            var error = Marshal.GetLastWin32Error();
+            if (error != 0)
+            {
+                ClearLastError();
+                throw new Win32Exception(error);
+            }
+        }
+
+        [LibraryImport("user32.dll", SetLastError = true)]
+        internal static partial void SetLastErrorEx(uint dwErrCode, uint dwType);
+
+        [LibraryImport("Kernel32.dll", SetLastError = true)]
+        public static unsafe partial uint GetFinalPathNameByHandleW(IntPtr hFile, char* lpszFilePath, uint cchFilePath, uint dwFlags);
+    }
+}