Unfortunately, these tools can't access OneNote files natively because they're not raw text files. This is one of the drawbacks of using a proprietary system like OneNote. If you used Obsidian, you could have AI interact with your whole notes system. 
So you could use it for organization, retrieval, editing, or whatever you can think of. For example: 

Not only can it read the files, it can modify and move them. 
If you're on Mac or Linux, just go install Claude Code, Gemini CLI, or ChatGPT's Codex, or better yet, all 3, and they will work out of the box once you authenticate your account. If you're on Windows, you'll need to setup WSL to use Claude Code. 
On Windows, you just open a terminal window and type "wsl" and once that loads, you type "claude" and hit enter, and then you're presented with the chat window:

From here, you just tell it to do whatever you want. You could say "programmatically switch to dark mode", and your entire system will switch. Or you could tell it "build me a custom chrome extension that renders the actualized.org forum as dark mode, based on Tailwind's Zinc theme", and it will build it. Fucking amazing!