Similar to LibreOffice, this is a legacy open-source suite that can read .ppt and .pptx files.
(for Windows 10) – Only functional as a curiosity on an air-gapped, legacy machine. powerpoint viewer windows 10
Native app, looks like real Office, free. Cons: optimized for touch; print options are limited on the free version. Similar to LibreOffice, this is a legacy open-source
: Free office suites like LibreOffice Impress or WPS Office can open and play PowerPoint files with high compatibility. Troubleshooting the Classic Viewer Similar to LibreOffice
If you are looking for the original for Windows 10, it is important to note that Microsoft officially retired and discontinued this standalone software in April 2018.