Which MIME types are related to file extension ".onepkg"?
The .onepkg file extension is associated with 1 MIME types:
A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.
About .onepkg Files
ONEPKG files are package files used by Microsoft OneNote. They bundle OneNote pages, sections, or even entire notebooks into a single file.
They use the MIME type application/onenote and are most often used for backing up or sharing note collections.
- Primary use: Compiling a set of OneNote data for easy transport and import.
- Other uses: Exchanging complete notebooks between devices.
- Software: Microsoft OneNote opens, views, and edits these files.
Relationship between file extension and MIME type
A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.
File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.
File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.
Associated MIME types
FAQs
How do I open a .onepkg file?
You need the desktop version of Microsoft OneNote installed on Windows to open these files. Double-clicking the file will launch the "Unpack Notebook" wizard, asking you where to save the extracted notebook contents. Note that the "OneNote for Windows 10" app may not support opening local package files directly.
Can I open .onepkg files on Mac or mobile devices?
No, the .onepkg format is specific to the Windows desktop version of OneNote. To view the content on macOS, iOS, or Android, you must first open the package on a Windows PC and share the notebook to OneDrive, allowing it to sync across devices.
How do I convert a .onepkg file to PDF?
You cannot convert the package file directly without opening it first. Open the file in Microsoft OneNote to unpack the notebook, then navigate to File > Export, select the scope (Page, Section, or Notebook), and choose PDF (*.pdf) as the output format.
What is the difference between .one and .onepkg files?
A .one file represents a single section within a notebook, while a .onepkg file is a compressed archive that bundles an entire notebook, including multiple sections and metadata. Both files are associated with the application/onenote MIME type.
How do I create a OneNote package for backup?
Open the notebook you wish to back up in the OneNote desktop application. Go to File > Export, select Notebook under the "Export Current" list, choose OneNote Package (*.onepkg), and click Export to save the file locally.
Why does my .onepkg file look like a ZIP folder?
Technically, a .onepkg file functions similarly to a ZIP archive containing .one section files and an open notebook header. If you rename the extension to .zip, you can explore the contents manually, though this is not recommended for normal use.
General FAQ
What is a MIME type?
A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.
MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.
MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.
How do I find the MIME type for a file?
You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.
Why can one extension have multiple MIME types?
Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.