1. Possible problems with the ONEPKG format files. The inability to open and operate the ONEPKG file does not necessarily mean that you do not have an appropriate software installed on your computer. There may be other problems that also block our ability to operate the Microsoft OneNote Package Format file. Below is a list of possible problems.
  2. Yes, I can open the onepkg in OneNote and then sync it back to SharePoint. I figured since the.onepkg is a template in a OneNote content type already in SP, I can just open it from SP to OneNote. Looks like a design flaw in SP. – JustAnotherDev Jan 20 '16 at 18:32.

It is possible that an application that supports ONEPKG files is not associated with such files. In such case, the program should by manually associated with ONEPKG files (right-click on the file icon → Properties → General Tab → In submenu 'Open with' and click on 'Change' button. ONEPKG files are opened by Microsoft's OneNote tool. You can download OneNote free from Onenote.com. You can back up your own.ONE files to a.ONEPKG file through OneNote's File Export Notebook menu option. Just choose to export the notebook to a OneNote Package file. On a Mac: Right-click on the file icon. Select “More Info” from the drop-down menu. Look for the file type listed under “Kind”. You Need Help From the Developer. If no programs will open the ONEPKG file, you can ask software developers for help. They know their software better than anyone, and they might be able to explain why you can.

Features of Free .ONE File Reader
(Open OneNote .ONEPKG or .ONE Files)

Preview Unlimited OneNote Files

ONEPKG File Opener software is capable to open unlimited OneNote documents one by one and preview all the details in software panel. This freeware software must be helpful for those who want to open OneNote files without OneNote installation.

Supports .ONEPKG and .ONE Files

Microsoft OneNote Reader download is available to open .ONEPKG or .ONE files of Microsoft OneNote with proper details. Most of users recommend this software to read OneNote files because it supports both OneNote extension for previewing the details.

Onenote For Mac Will Not Open Onepkg File

Horizontal and Vertical Views

After selecting ONEPKG or ONE files for previewing, software gives dual options i.e. Horizontal View or Vertical View to read OneNote files in different ways . Fist select the OneNote files for preview in software panel after that click on Horizontal or Vertical option.

Onepkg

Preview All OneNote Information

Onenote Cannot Open Onepkg

ONE File Open Software is capable to read ONEPKG or ONE files in software panel including proper details. It is capable to text formatting, headings, ordered list, unordered list, attachment, pictures, tables, files, stickers, drawing, notebook, sections and all.

Zoom Options Available to View

After selecting OneNote files into software panel, users can click on Zoom (+) button to preview OneNote files into bigger size and if you want to view OneNote files into small size then click on Zoom (-) button. This feature is most helpful for users.

Next and Previous Buttons

Suppose if someone open ONEPKG file in software panel which has multiple page in this situation software gives separate options to go on Next or Previous pages by clicking on “Next Button” and “Previous Button”. The options is helpful to jump on any page directly.

Onenote For Mac Will Not Open Onepkg Files

Maintains Data Integrity

Onepkg

One File Open Software maintains data integrity during previewing the *.one or *.onepkg files. This software maintains text formatting (font size, font style, font colour), attachment, pictures, tables, files, sections, drawing, stickers, and all the details.

Onenote For Mac Will Not Open Onepkg File Electronically

File

Onenote Open Onepkg

Upgrade Option Available

Onenote Mac Open Onepkg

As it is free software which is well suitable to view OneNote files without having any limitations but if someone want to convert OneNote files into other formats then upgrade option is also available. Pro edition of OneNote Opener is helpful for corporate use.