Good to mention your original was 4:3. Also if this works can I ask that you go back to the other forums where you asked because otherwise folk may be working away on it whan you already have an answer.
Sub splitFiles()
Dim tempR As Presentation
Dim opres As Presentation
Dim L As Long
Dim oFolder As String
'requires v. 2010 or later
On Error Resume Next
Set opres = ActivePresentation
Set tempR = Presentations.Add
tempR.PageSetup.SlideSize = opres.PageSetup.SlideSize
oFolder = Environ("USERPROFILE") & "\Desktop\Files\"
MkDir oFolder
For L = 1 To opres.Slides.Count
opres.Slides(L).Copy
tempR.Windows(1).Panes(1).Activate
Call CommandBars.ExecuteMso("PasteSourceFormatting")
Call tempR.SaveCopyAs(oFolder & "Slide" & CStr(L) & ".pptx", ppSaveAsOpenXMLPresentation)
tempR.Slides(1).Delete
Next L
tempR.Saved = True
tempR.Close
End Sub