AlphanumericComparer.cs

    public static class WinApi
    {
        [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
        public static extern int StrCmpLogicalW(string s1, string s2);
    }

    class AlphanumericComparer : IComparer<string>
    {
        public int Compare(string x, string y)
        {
            return WinApi.StrCmpLogicalW(x, y);
        }

        public static AlphanumericComparer<T> For<T>(T obj, Func<T, string> func)
        {
            return new AlphanumericComparer<T>(func);
        }
    }

    class AlphanumericComparer<T> : IComparer<T>
    {
        private readonly Func<T, string> _func;

        public AlphanumericComparer(Func<T, string> func)
        {
            _func = func;
        }

        public int Compare(T x, T y)
        {
            return WinApi.StrCmpLogicalW(_func(x), _func(y));
        }
    }