ONE (OneNote Document)
The ONE Data file format
The file extension .ONE has been introduced by the note-taking application OneNote. Developed by Microsoft, OneNote runs on Windows computers and allows the user to take notes, gather information and collaborate with other users. ONE is an open file format that stores all the contained information and files in one binary file.
Technical details of ONE files
A ONE file can contain typed text as well as digital handwriting. Next to the text, it can also contain images, videos, audio clips, drawings and other graphics. The whole Notebook of OneNote is stored in the ONE file, containing a folder structure.