■http://anond.hatelabo.jp/20150312122358

マジレスすると、U+00a5なら使える。俺なら設計を修正させるけど。

Path.GetInvalidFileNameChars メソッド (System.IO)

using System;
using System.IO;

namespace TestInvalidFileName
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get a list of invalid file characters.
            char[] invalidFileChars = Path.GetInvalidFileNameChars();

            Console.WriteLine("The following characters are invalid in a filename:");
            ShowChars(invalidFileChars);
            Console.WriteLine();

            string fileName = '\u00a5' + "108";
            using (var fs = File.Create(fileName))
            {
                if (fs != null)
                {
                    Console.WriteLine("File was created:" + fileName);
                    fs.Close();
                }
                else {
                    Console.WriteLine("File was not created:" + fileName);
                }
            }
        }

        public static void ShowChars(char[] charArray)
        {
            Console.WriteLine("Char\tHex Value");
            // Display each invalid character to the console.
            Array.Sort(charArray);
            foreach (char someChar in charArray)
            {
                if (Char.IsWhiteSpace(someChar))
                {
                    Console.WriteLine(",\t{0:X4}", (int)someChar);
                }
                else
                {
                    Console.WriteLine("{0:c},\t{1:X4}", someChar, (int)someChar);
                }
            }

        }
    }
}

The following characters are invalid in a filename:
Char    Hex Value
（中略）
",      0022
**,      002A
/,      002F
:,      003A
>,      003C
>,      003E
?,      003F
\,      005C
|,      007C

File was created:\108

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