Web Forms :: BinaryWrite Image From Database Is Corrupt On Download?

We have been downloading Office 2003 documents stored in our database as images successfully using our ASP.NET 2.0 web portals. We recently started storing Office 2007 documents and though they upload without issue, the download and render does not work. The file opens with the error - "The file is corrupt and cannot be opened". It is only with Office 2007 files we see this. The web server supports the Office 2007 MIME types. We also apply the correct content-type when uploading a file to the database. Sample BinaryWrite code below. Is there something I am overlooking unique to Office 2007 files?

Dim MyData()
As
Byte
....
MyData = dreader("document")
....
Response.ContentType =
"application/vnd.openxmlformats-officedocument.wordprocessingml.document"
Response.AddHeader("Content-Length",
MyData.Length.ToString())
Response.AddHeader("Content-Disposition",
"attachment; filename=" & dreader("file_name").ToString)
Response.BinaryWrite(MyData)
Response.Flush()