I grabbed the original .ONECACHE file, and while I worked out how to open it, tried a workaround; right-click on the section in OneNote and save it out.

It’s important not to delete these files, as they are essential for uninstalling, updating, or repairing software on your system. Restore Missing Windows Installer Cache files ...

Clearing the cache of your computer can improve its performance, and here's how you can do it if you're using a Windows 11 ...

Google Chrome could be storing a hundred thousand cached files on your computer, and it doesn't give you a way to delete them.

Efforts to resolve the issue using system commands such as 'SFC Scannow' have proven ineffective, and the Disk Cleanup utility consistently reports the cache file size as 8.63GB.