Why is my PowerPoint presentation showing up as a zip file?

Verify the download options. Check the settings to make sure that PowerPoint is selected for the file type you intend to download. Maybe you hit a wrong key by mistake?

Ensure you are using current programs. Make sure the browser or application you are using is up to date. Sometimes compatibility issues can occur with older versions of software.

Download the file again. Try downloading the file after closing out all applications that might be running in the background.

Check for malicious threats. Make sure your computer is not infected with a virus that might be causing issues with files. Run a quick security scan.