A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
You probably should set a reference to the Excel 15 Object Library in Tools > References in the vb editor to do this and then
Sub fixEmALL()
Dim ocht As Chart
Dim oshp As Shape
Dim osld As Slide
Dim wb As Excel.Workbook
Dim ws As Excel.Worksheet
Dim strText As String
For Each osld In ActivePresentation.Slides
For Each oshp In osld.Shapes
If oshp.HasChart Then
Set ocht = oshp.Chart
ocht.ChartData.Activate
Set wb = ocht.ChartData.Workbook
Set ws = wb.Worksheets(1)
ws.Cells.Replace What:="old", Replacement:="new"
ocht.Refresh
wb.Close
End If
Next oshp
Next osld
End Sub