.ONEPKG File Extension
File TypeMicrosoft OneNote Package File
What is an ONEPKG file?
Package file created by OneNote, a program that allows users to create and manage digital notes information; contains multiple OneNote files packaged into a single archive; used to publish notes to other users and to backup OneNote files.
ONEPKG files may be imported, or "unpacked", to a local folder by double-clicking the file and choosing the destination folder in OneNote.