Simple console application to identify cultures with different capitalization rules.

Program.cs

static void Main()
{
    const string lowerCharacters = "abcdefghijklmnopqrstuvwxyz";
    const string upperCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    var cultures = CultureInfo.GetCultures(CultureTypes.AllCultures);
    foreach (var culture in cultures)
    {
        var upper = lowerCharacters.ToUpper(culture);
        var lower = upperCharacters.ToLower(culture);

        if (upperCharacters != upper || lowerCharacters != lower)
        {
            Console.WriteLine(culture.Name);
        }
    }

    Console.WriteLine();
    Console.WriteLine("Total cultures: {0}", cultures.Length);
    Console.ReadLine();
}