How to open a PowerPoint presentation on MacOS

Question

I have a VBA code running under Excel 2016 (Windows) that exports charts to a PowerPoint file (.pptx).
I am trying to make that run on MacOS.

I first rewrote the FileDialogOpen function for MacOS to browse and pick up one .pptx file to open for editing.
While opening the picked file on MacOS (Office 2016 as well), I get the following error:

It seems a PowerPoint application is started but the specified .pptx file is not loaded. I checked the file name variable is assigned to the full path filename that was picked up (including extension .pptx).

The code failing on Open.

Sub Export_Charts_To_PPT_Presentation()
    
    Dim PptApp As PowerPoint.Application
    Dim PptDoc As PowerPoint.Presentation
    
    Set PptApp = New PowerPoint.Application
    
    PptPresPath = FileDialogOpen
    If PptPresPath = "" Then Exit Sub
    Set PptDoc = PptApp.Presentations.Open(PptPresPath, WithWindow:=msoTrue)

End Sub

Function FileDialogOpen() As String

    mypath = MacScript("return (path to desktop folder) as String")

    sMacScript = "set applescript's text item delimiters to "","" " & vbNewLine & _
      "try " & vbNewLine & _
      "set theFiles to (choose file " & _
      "with prompt ""Please select a file or files"" default location alias """ & _
      mypath & """ multiple selections allowed false) as string" & vbNewLine & _
      "set applescript's text item delimiters to """" " & vbNewLine & _
      "on error errStr number errorNumber" & vbNewLine & _
      "return errorNumber " & vbNewLine & _
      "end try " & vbNewLine & _
      "return theFiles"

    FileDialogOpen = MacScript(sMacScript)
End Function

Answer 1

Try this:

Sub Export_Charts_To_PPT_Presentation()
    
    Dim PptApp As PowerPoint.Application
    Dim PptDoc As PowerPoint.Presentation
    Dim PptPresPath As String
    
    PptPresPath = FileDialogOpen
    
    If PptPresPath = "" Or Right(PptPresPath, 5) <> ".pptx" Then Exit Sub
    
    Set PptApp = New PowerPoint.Application
    Set PptDoc = PptApp.Presentations.Open(PptPresPath, WithWindow:=msoTrue)

End Sub

Function FileDialogOpen() As String

    Dim iPathStartPosition As Integer
    
    mypath = MacScript("return (path to desktop folder) as String")
    sMacScript = "set applescript's text item delimiters to "","" " & vbNewLine & _
        "try " & vbNewLine & _
        "set theFiles to (choose file " & _
        "with prompt ""Please select a file or files"" default location alias """ & _
        mypath & """ multiple selections allowed false) as string" & vbNewLine & _
        "set applescript's text item delimiters to """" " & vbNewLine & _
        "on error errStr number errorNumber" & vbNewLine & _
        "return errorNumber " & vbNewLine & _
        "end try " & vbNewLine & _
        "return theFiles"
  
    FileDialogOpen = Replace(MacScript(sMacScript), ":", "/")
    
    If Val(FileDialogOpen) = -128 Then
        FileDialogOpen = ""
    Else
        iPathStartPosition = InStr(1, FileDialogOpen, "/Users")
        If iPathStartPosition > 0 Then
            FileDialogOpen = Right(FileDialogOpen, Len(FileDialogOpen) - iPathStartPosition + 1)
        End If
    End If
End Function