Copying Excel File fails...

Question

Hello some help is needed.
We are testing reading writing of bytes using
FileIO.FileSystem.ReadAllBytes()
And then the other side
FileIO.FileSystem.WriteAllBytes()
We have to use bytes for many reason which one is a hash of the bytes is saved in a log as evidence, other reason is the bytes must be encrypted then block communicate with certain points a crc or hash and to hardware and so forth.
So the excel file when opened says: "We found a problem with some content in 'filename.xlsm'. Do you want us to try to recover as much as we can? If you trust the source of this workbook, click Yes."
Using filecompare the files are identical (original and copy) when properties: the file properties are different, there are no author and similar property. Filled the Excel file with 2mb of data and the copy contains it all so we think the file copy is ok.
We need to make the message not appear or have proof that data is not harmed, please any advices?
We use office 2013 64bit with windows 7 64 bit. The file copy works on every file we can do binary compare and it is good. We tested with XP and 32 bit windows 7 and all of them work and do the same problem with Excel file.
My goal of posting is to make you and I better educated programmers while solving our problems ✘

Answer 1

I can't duplicate the problem:
Option Strict On
Option Explicit On
Option Infer Off
Imports System.IO.Path
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Load
Dim desktop As String = _
My.Computer.FileSystem.SpecialDirectories.Desktop
Dim excelFilePath As String = _
Combine(desktop, "Dickson Annual Inspection Workbook.xlsm")
Dim b() As Byte = _
My.Computer.FileSystem.ReadAllBytes(excelFilePath)
My.Computer.FileSystem.WriteAllBytes(Combine(desktop, _
"testme.xlsm"), b, _
False)
Stop
End Sub
End Class
It might be the difference in the Excel version though, but the test file opened without error and contains everything the original does.
Still lost in code, just at a little higher level.