public static List<string> FindSupportedFiles(string root)
{
    Queue<string> folders = new Queue<string>();
    List<string> files = new List<string>();

    folders.Enqueue(root);
    while (folders.Count != 0)
    {
        string currentFolder = folders.Dequeue();

        // this checks are not tested
        if (filepath.Contains(":/Windows/")) currentFolder = folders.Dequeue();
        if (filepath.Contains(":/Users/") &&
            filepath.Contains("/AppData/")) currentFolder = folders.Dequeue();

        string[] filesInCurrent = null;
        try
        {
            filesInCurrent = Directory.GetFiles(currentFolder, "*.*");
        }
        // Ignore this exceptions
        catch (UnauthorizedAccessException) { }
        catch (PathTooLongException) { }

        foreach (string f in filesInCurrent)
            if (SomeLib.IsSupported(f)) files.Add(f);

        try
        {
            string[] foldersInCurrent = Directory.GetDirectories(currentFolder);
        }
        // Ignore this exceptions
        catch (UnauthorizedAccessException) { }
        catch (PathTooLongException) { }
        catch (DirectoryNotFoundException) { }

        foreach (string _current in foldersInCurrent)
            folders.Enqueue(_current);
    }
    return files;
}