PPT and PPTX are file formats that Microsoft PowerPoint uses for its presentations. PPTX is the newer version of PPT that is based on XML. Due to the support of XML, it is much easier for other programs to open the presentations with the newer PPTX format. There might be situations where you need to migrate your old PPT files to the newer PPTX format. For such cases, this article will teach you how to convert PowerPoint PPT files to PPTX format using C++.