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' For complete examples and data files, please go to https://github.com/groupdocs-metadata/GroupDocs.Metadata-for-.NET
Dim files As String() = Directory.GetFiles(directoryPath)

For Each path__1 As String In files
    ' detect format
    Dim format As FormatBase = FormatFactory.RecognizeFormat(path__1)
    If format Is Nothing Then
        ' skip unsupported format
        Continue For
    End If

    If format.Type = DocumentType.Wav Then
        Console.WriteLine("File {0} has WAV format", Path.GetFileName(path__1))
    End If
Next