Structure because structure

Tools/WindowsAPI/WindowsUtils.cs

@@ -0,0 +1,33 @@
+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);
+    }
+}

Tools/WindowsAPI/kernel32.cs

@@ -0,0 +1,25 @@
+using System.Runtime.InteropServices;
+
+namespace Xorog.UniversalExtensions.WindowsAPI;
+
+public class kernel32
+{
+    /// <summary>
+    /// Opens an existing local process object.
+    /// </summary>
+    /// <param name="processAccess">The access to the process object. This access right is checked against the security descriptor for the process. This parameter can be one or more of the process access rights.</param>
+    /// <param name="bInheritHandle">If this value is TRUE, processes created by this process will inherit the handle. Otherwise, the processes do not inherit this handle.</param>
+    /// <param name="processId">The identifier of the local process to be opened.</param>
+    /// <returns>If the function succeeds, the return value is an open handle to the specified process. If the function fails, the return value is NULL.</returns>
+    [DllImport("kernel32.dll")]
+    public static extern IntPtr OpenProcess(uint processAccess, bool bInheritHandle, int processId);
+
+    /// <summary>
+    /// Closes an open object handle.
+    /// </summary>
+    /// <param name="hObject">A valid handle to an open object.</param>
+    /// <returns>If the function succeeds, the return value is true.</returns>
+    [DllImport("kernel32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static extern bool CloseHandle(IntPtr hObject);
+}

Tools/WindowsAPI/psapi.cs

@@ -0,0 +1,10 @@
+using System.Runtime.InteropServices;
+
+namespace Xorog.UniversalExtensions.WindowsAPI;
+
+#pragma warning disable CS8981 // The type name only contains lower-cased ascii characters. Such names may become reserved for the language.
+public class psapi
+{
+    [DllImport("psapi.dll")]
+    public static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, [In][MarshalAs(UnmanagedType.U4)] int nSize);
+}