Why Can Only PowerPoint 2007+ Run Redasteroid?

You might notice that the file type is PPSM when you download the game. This is a type of PPTX file (presentation file). Before PowerPoint 2007, the file format was PPT, which was first introduced with PowerPoint 97. The PPT format was quite outdated, and as Microsoft wanted to implement new features and improvements, they introduced the PPTX format in PowerPoint 2007.

PowerPoint 2007 was the first version to support the PPTX format, which is why Redasteroid can only be played with PowerPoint 2007 or later versions.

Microsoft explains, "The main difference between PPT and PPTX files is that the XML-based PPTX format is considered ‘open source.’ This means it is much easier for other types of presentation programs to open files saved in the PPTX format."