Add WindowsAPI/

Will add new functions as i need them.

WindowsAPI/WindowsUtils.cs

@@ -0,0 +1,35 @@
+using System.Runtime.CompilerServices;
+
+namespace Xorog.UniversalExtensions.WindowsAPI;
+
+public class WindowsUtils
+{
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static FileInfo? GetMainModuleFilepath(int pid)
+    {
+        var processHandle = kernel32.OpenProcess(0x0400 | 0x0010, false, pid);
+
+        if (processHandle == IntPtr.Zero)
+        {
+            return null;
+        }
+
+        const int lengthSb = 4000;
+
+        var sb = new StringBuilder(lengthSb);
+
+        string? result = null;
+
+        if (psapi.GetModuleFileNameEx(processHandle, IntPtr.Zero, sb, lengthSb) > 0)
+        {
+            result = Path.GetFullPath(sb.ToString());
+        }
+
+        kernel32.CloseHandle(processHandle);
+
+        if (result == null)
+            return null;
+
+        return new FileInfo(result);
+    }
+}