Having issues loading a 2007 word doc from blob file in asp.net web page

Hello experts,
I am having issues when I try to open a 2007 word doc from my asp.net page.  I get this messagebox when I try to open the document: The office open xml file "name here[1]" cannot be opened because there are problems with the contents.  When I click OK, I get this message:  Word found unreadable content in "doc name here[1]".  Do you want to recover the contents of the document?  When I click OK, the document loads up, but users may become concerned when they get these 2 messages.  

I found a solution, when I load up the content-type, I change it back to the old word content-type,
before I did this the file would not load up at all.  Is this a problem with how I am storing it in the database? Or is this a problem with how I am trying to retrieve it?  Here is my code for viewing the file.

 Sub read_blob_file(ByVal attach_id As Integer, ByVal row_id As Integer)
        Dim ssql As String
        Dim file_type, file_name As String
        Dim dr As OracleDataReader
        ssql = "SELECT File_type,File_name FROM text_doc_load WHERE attachment_id = " & attach_id & " and " & _
        "attach_row_id = " & row_id & ""
        dr = db_tool.GetData(ssql)
        Try
            While dr.Read
                file_type = dr.GetString(0)
                file_name = dr.GetString(1)
            End While
            dr.Close()
            If file_type = "application/vnd.openxmlformats-officedocument.wordprocessingml.document" Then
                file_type = "application/msword"
            End If
             db_tool.objconn.Open()

            ssql = "select file_data FROM text_doc_load WHERE attachment_id = " & attach_id & " and " & _
        "attach_row_id = " & row_id & ""
            Dim cmd As OracleCommand = db_tool.objconn.CreateCommand()
            cmd.CommandText = ssql
            Dim _buf As Byte() = cmd.ExecuteScalar()
         
            'stream it back in the HTTP response
            Response.ContentType = file_type
             Response.AddHeader("Content-disposition", "attachment;filename=" & file_name)
            Response.BinaryWrite(_buf)
        Catch ex As Exception
            Dim l As String
            l = ex.Message
        Finally
            db_tool.objconn.Close()
        End Try
    End Sub