Microsoft Corporation is said to be the creator of a lot of document formats including .docx, .pptx, .xps, etc. All of these document formats are meant to be opened by their respective viewer, but we know better that we can view and edit almost all of the office supported formats in free software like Open Office. The thing is not many people uses all of these document formats. So people tend to move towards file format converters like the ones I’m going to share.
