// アイコンの参照イベント
        private void IconRefButton_Click(object sender, EventArgs e)
        {
            DialogResult dr = OpenPicFileDialog.ShowDialog();

            if (dr == DialogResult.OK)
            {
                IconText.Text = GetRelPath(OpenPicFileDialog.FileName, @"\Icon");
            }
        }
        // サムネイルの参照イベント
        private void ThumbRefButton_Click(object sender, EventArgs e)
        {
            DialogResult dr = OpenPicFileDialog.ShowDialog();

            if (dr == DialogResult.OK)
            {
                ThumbnailText.Text = GetRelPath(OpenPicFileDialog.FileName, @"\Thumbnail");
            }
        }