PowerToys/src/common/ManagedCommon/NativeMethods.cs

using System;
using System.Runtime.InteropServices;

namespace ManagedCommon
{
    internal static class NativeMethods
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        internal static extern IntPtr OpenProcess(uint processAccess, bool bInheritHandle, int processId);

        [DllImport("kernel32.dll", SetLastError = true)]
        internal static extern uint WaitForSingleObject(IntPtr hHandle, uint dwMilliseconds);
    }
}