我认为，您应该将Untitled参数(Open方法)设置为true，以打开模板文件.

In my opinion, you should open your template file with the Untitled parameter (Open method) set to true.

objPPT.Presentations.Open FileName:="MyTemplate Macro.potm", Untitled:=msoTrue

根据 Presentations.Open方法(PowerPoint) ，

打开不带标题的文件.这等效于创建副本 文件.

Opens the file without a title. This is equivalent to creating a copy of the file.