One One, a free mobile phone reading software, is edited and supervised by Han Han. Less than 24 hours after its release, it ranked first in the AppStore for free, with a favorable rate of over 90%. A good article every day, a group of good pictures every day, a fresh literary model, just ask a question and play whatever you want. A file is a record file, and a package is used to store one or more parts of one or more pages. It can contain text, digital handwriting, pictures, drawings and audio/video clips. There is usually a file in OneNoteDocument format. Most of these files are classified as data files. Windows, Mac and iOS support the file extension 1. Tools/Materials: Take notepad++ and one files as examples. 1. First, on the desktop, click the "One file format" icon. 2. Then in this interface, right-click the "Open with" option. 3. Then in this interface, double-click the Notepad++application software. 4. Finally, in the "Notepad++"application software interface, the file content in one format is displayed.