''' <summary>
''' Removes the embedded file from PDF document by the name of embedded file specification.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
''' <param name="embeddedFileName">Name of the embedded file specification.</param>
''' <returns><b>true</b> if the file is found and successfully removed; otherwise, <b>false</b>.</returns>
Public Shared Function RemoveEmbeddedFileFromPdfDocument(pdfFilename As String, embeddedFileName As String) As Boolean
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
        ' if embedded files are absent
        If document.EmbeddedFiles Is Nothing OrElse document.EmbeddedFiles.Count = 0 Then
            Return False
        End If
        ' try to remove embedded file specification
        If Not document.EmbeddedFiles.Remove(embeddedFileName) Then
            Return False
        End If
        ' save changes to the source
        document.SaveChanges()
        Return True
    End Using
End Function

/// <summary>
/// Removes the embedded file from PDF document by the name of embedded file specification.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
/// <param name="embeddedFileName">Name of the embedded file specification.</param>
/// <returns><b>true</b> if the file is found and successfully removed; otherwise, <b>false</b>.</returns>
public static bool RemoveEmbeddedFileFromPdfDocument(string pdfFilename, string embeddedFileName)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
    {
        // if embedded files are absent
        if (document.EmbeddedFiles == null || document.EmbeddedFiles.Count == 0)
            return false;
        // try to remove embedded file specification
        if (!document.EmbeddedFiles.Remove(embeddedFileName))
            return false;
        // save changes to the source
        document.SaveChanges();
        return true;
    }
}