You can simply re-save POTX files to PPT ones using the default File → Save as.. function in PowerPoint or similar presentation software that supports its file types.
Convert Microsoft PowerPoint Open XML presentation template to Microsoft PowerPoint 97 to 2003 presentation.
We found 5 software records in the database related to .potx to .ppt file format conversion.
Microsoft Windows software - convert potx to ppt on Windows
A presentation program from the Microsoft Office suite
Convert from potx file format
|Yes, Microsoft PowerPoint supports potx file conversion as a source file type.||Yes||Yes||potx editor||Yes||No||No||No|
|Yes, Microsoft PowerPoint supports ppt file conversion as a target file type.||Yes||Yes||ppt editor||Yes||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned potx to ppt. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A free set of productivity tools for creating and editing of various documents, spreadsheets or presentations from IBM
Apple macOS / Mac OS X software - convert potx to ppt on OS X
Mac version of popular presentation software from Microsoft
Multiplatform software - convert potx to ppt on any platform
Powerful multimedia presentation software tool from LibreOffice suite
Free presentation program from OpenOffice.org