Here is the situation. You are going to do an important presentation in an international conference. You have made your presentation slides, it’s like the greatest presentation in the universe. You made the presentation using the latest version of Microsoft PowerPoint or OpenOffice.org Impress. You double checked your presentation and laptop right before you’re doing your presentation. Suddenly, out of nowhere, your laptop crash, error, bsod, or anything. You have no choice, you transfered your slides file to another computer that can do presentation. Unfortunately, the computer didn’t have the program that can open your slides. The computer has the older version of PowerPoint that couldn’t open your slides. Or maybe the computer using another operating system that your presentation program didn’t support. You’re panic and can’t think clearly. Everything went dark and suddenly you passed out.