Not sure what you mean by "ownership", author perhaps. If so, install
dsoFile
http://support.microsoft.com/kb/224351/en-us
Sub test()
' Tools/refs DSO OLE Document Properties Reader
Dim sFile As String
Dim sAuthorOrig As String
Dim sAuthorNew As String
sAuthorNew = "Funtime"
Dim dso As DSOFile.OleDocumentProperties
Set dso = New DSOFile.OleDocumentProperties
' some loop here
sFile = "C:\temp\book1.xls"
ds

pen sfilename:=sFile
' sAuthorOrig = dso.SummaryProperties.Author
dso.SummaryProperties.Author = sAuthorNew
dso.Save
' end loop
dso.Close
End Sub
Regards,
Peter T