There are myriad file types, and this PDF, DOC, XLS, PPT, TXT Reader app will help to read just about any file type on an iOS device. Developed by independent developer Kirill Mazur, this app supports files such as PDF, .doc, .ppt, .xml, .html, .txt, images and videos. With mobility in place, this app will help businessmen/women to open up necessary and important documents at all times. This free app has a 30-times zoom feature, supports portrait and landscape modes, and has the ability to create bookmarks and organize functions for documents. It has a built-in Internet browser and to utilize documents can be downloaded through Wi-Fi. There is also a password setup for the app to keep important files guarded. It supports iPhone 3G, 3Gs, 4, 4s, 5, iPod touch 2, 3, 4 and all iPad versions.