Preserving powerpoint/excel property data after converting to pptx/xlsx - excel

Question

I have vba code to convert a ppt to pptx file, but how do I preserve the file properties (author/created date, modified date, etc)? Here is the vba code that converts the, in this case .ppt file, to a pptx file.
Sub BatchSave()
' Opens each PPT in the target folder and saves as PowerPoint 2007/2010 (.pptx) format
Dim sFolder As String
Dim sPresentationName As String
Dim oPresentation As Presentation
Dim bidpList As Collection
' Select the folder:
Set fDialog = Application.FileDialog(msoFileDialogFolderPicker)
With fDialog
.Title = "Select folder and click OK"
.AllowMultiSelect = False
.InitialView = msoFileDialogViewList
If .Show <> -1 Then
MsgBox "Cancelled By User", , "List Folder Contents"
Exit Sub
End If
sFolder = fDialog.SelectedItems.Item(1)
If Right(sFolder, 1) <> "\" Then sFolder = sFolder + "\"
End With
' Make sure the folder name has a trailing backslash
If Right$(sFolder, 1) <> "\" Then
sFolder = sFolder & "\"
End If
' Are there PPT files there?
If Len(Dir$(sFolder & "*.PPT")) = 0 Then
MsgBox "Bad folder name or no PPT files in folder."
Exit Sub
End If
' Open and save the presentations
sPresentationName = Dir$(sFolder & "*.PPT")
While sPresentationName <> ""
Set oPresentation = Presentations.Open(sFolder & sPresentationName, , ,
False)
Call oPresentation.SaveAs(sFolder & sPresentationName & "x")
oPresentation.Close
Wend
MsgBox "DONE"
End Sub

Answer 1

Declaring object variables for your two presentations will simplify the code a bit, and then you can do something along these lines:
Dim oPres As Presentation
Dim oCopyPres As Presentation
Dim x As Long
Set oPres = ActivePresentation
ActivePresentation.SaveCopyAs "c:\temp\test.pptx"
Set oCopyPres = Presentations.Open("c:\temp\test.pptx")
On Error Resume Next
For x = 1 To oPres.BuiltInDocumentProperties.Count
oCopyPres.BuiltInDocumentProperties(x).Name = oPres.BuiltInDocumentProperties(x).Name
oCopyPres.BuiltInDocumentProperties(x).Value = oPres.BuiltInDocumentProperties(x).Value
Next
You'll want to modify this to set WithWindow false and to use variables as file names, but you're already doing that in the code you have. It should be simple enough to fold in a modified version of the code above.