File stream is showing "?" for arabic fonts in vb.net when we are try to open in word?

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VB

We are using a small application which searches and checks for the data available in database. If it is available then the document can be viewed in ".doc" format where the font for arabic showing "?". What i have to do. this is code which i am using for document viewing is

Dim fileData As Byte()
fileData = Encoding.ASCII.GetBytes(strstream)
Dim sTempFileName As String = Application.StartupPath & "\" & sfilename
If Not fileData Is Nothing Then

End If
'Read image data into a file stream
Using fs As New FileStream(sfilename, FileMode.OpenOrCreate, FileAccess.Write)
fs.Write(fileData, 0, fileData.Length)
'Set image variable value using memory stream.
fs.Flush()
fs.Close()
End Using

'Open File
Process.Start(sfilename)

I have already installed in my systema all the kinds of arabic fonts but still it is having same problem . please help me.