Read tags set by windows 10 explorer on audio files using taglib nuget package

AudioFileTagReader.cs

/// DISCLAIMER: This is a hacky reverse engineering, I have no idea what the actual syntax is or how it works
/// will probably break in some cases, but so far has worked for a couple hundred different files for me
/// Line 27 is a sanity check for this hack, if you use special characters in your tags it will alert you

using System;
using System.Linq;
using System.Collections.Generic;
using TagLib;

static class AudioFileTagReader
{
    static readonly string[] allowed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 äöüÄÖÜ!?:".ToArray();
    
    static IEnumerable<string> getCategories(TagLib.File file)
    {
        var ubox = (List<TagLib.Mpeg4.IsoUserDataBox>)file.GetType().GetProperty("UdtaBoxes", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(file);
        return getCategories(ubox, file.Name);
    }

    static IEnumerable<string> getCategories(List<TagLib.Mpeg4.IsoUserDataBox> userDataBoxes, string filename)
    {
        foreach (var dbox in userDataBoxes)
            foreach (var result in recursiveExplore(dbox))
            {
                if(Debugger.IsAttached)
                {
                    if(result.Any(x => !allowed.Contains(x)))
                    {
                        Console.ForegroundColor = ConsoleColor.Yellow;
                        Console.WriteLine($"Suspicious Tag in File {filename}: {result}");
                        Console.ResetColor();
                    }
                }
                yield return result;
            }
    }
    static IEnumerable<string> recursiveExplore(TagLib.Mpeg4.Box box)
    {
        if (box.Data != null)
        {
            if (box.BoxType == (ReadOnlyByteVector)"Xtra")
            {
                var category = box.Data.ToString(TagLib.StringType.Latin1);
                var items = category.Split(new[] { /*"\u0010"*/ "\0\b" }, StringSplitOptions.RemoveEmptyEntries).Skip(1).ToArray();
                foreach (var item in items)
                {
                    string local = item;
                    var end = item.IndexOf("\0\0\0\0\0\0");
                    if (end != -1)
                    {
                        local = local.Substring(0, end);
                    }
                    local = local.Replace("\u0010", "").Replace("\u001c", "").Replace("\0", "").Replace("\b", "");
                    if (local.StartsWith("("))
                        local = local.Substring(1);
                    if (local.EndsWith("("))
                        local = local.Substring(0, local.Length - 1);
                    if (!string.IsNullOrWhiteSpace(local))
                        yield return local.Trim();
                }
            }
        }

        if (box.HasChildren)
            foreach (var child in box.Children)
                foreach (var result in recursiveExplore(child))
                    yield return result;
    }
}