<p>As gushie said, openlp.org uses the COM API to figure out if PowerPoint is there, and running. However, that said, it also depends on what version of PowerPoint is running on the developer's machine, and therefore what version of PowerPoint openlp.org is compiled against. I didn't compile the latest versions of openlp.org, so I don't know what version of PowerPoint openlp.org was compiled against. I'll have to check with the developer who compiled the latest version of openlp.org.</p>