Programs used to perform the conversion from pptx file to thmx format.
You can apply .thmx themes from older versions of Microsoft Office (2007) to Microsoft PowerPoint presentations (.pptx) and other Office documents created in version 2007. This function does not seem to be available in latest version of MS Office and was most likely removed.
But it might not be possible to recover .thxm theme out of existing .pptx document, so pptx to thmx conversion seems unlikely.
Updated: August 2, 2022
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open pptx file, Open thmx file
PPTX
A pptx file extension is used for the default presentation format of latest editions of PowerPoint from Microsoft Office. PowerPoint slide shows are basically set of screens which can include text, graphic, sounds or videos used for various presentation purposes.
THMX
Files with thmx extension are themes for Microsoft Office that can customize the appearance of documents created in the program. Its some sort of universal looking template across all supported Office applications - Excel, Word and PowerPoint.
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