http://www.perlmonks.org?node_id=704311


in reply to Re^2: Convert PowerPoint Presentation to Word Document with Win32::OLE
in thread Convert PowerPoint Presentation to Word Document with Win32::OLE

The problem seems to be that newer versions of OLE don't export the relevant constants for hidden methods like Export. Adding

$ole_const->{ppShapeFormatPNG} = 2;

just after the lines that import the OLE constants seems to fix the problem.