您好Sandra，

Hi Sandra,

您可以修改注册表"HKEY_CLASSES_ROOT\PowerPoint.Show.12"值为Regedit.exe中的8。

You can modify the registry "HKEY_CLASSES_ROOT\PowerPoint.Show.12" value to 8 in Regedit.exe.

参考：

https://blogs。 technet.microsoft.com/office_integration__sharepoint/2015/08/14/o ffice-2013-opens-ppsx-files-in-powerpoint-instead-slide-show-mode /

祝你好运，

Grace Wang

Grace Wang