Microsoft PowerPoint MIME HTML Presentation
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What is a PPTMHTML file?
A PPTMHTML file is an archived Multipurpose Internet Mail Extensions (MIME) HTML presentation saved by earlier versions of Microsoft PowerPoint, a program used to create slide shows. It contains HTML code that represents the presentation in the same format as the original .PPT file. PPTMHTML files are used for viewing the published version of a presentation in a web browser.
Microsoft PowerPoint no longer supports the PPTMHTML format. Instead, you can share presentations online by selecting Slide Show → Present Online in PowerPoint 365. This Office Presentation Service allows you to publish your presentation online where others can view it in a web browser.
How to open a PPTMHTML file
Unfortunately, there are no known applications that fully support the PPTMHTML format since Microsoft PowerPoint dropped support for it.