Every time when i download my lecture notes from my school website, it is in a form of powerpoint slides, the extension will always become Lecture1.ppt.pot Somehow it automatically adds the .POT behind it and i hate it. i have to rename it numerous of times. The problem is that i can't use the quick preview, the pressing of the spacebar to quickly preview the content of the documents. And i tend to have alot of documents/lecture notes to download so it gets kinda messy and its not really run to open every lecture notes and documents just to check The same goes for words document it will add a .dot and the documents will be Document1.doc.dot Any ideas why this is happening? and How do i stop it from adding such extension?