I had an Atomic wallet I uninstalled months ago. I didn't care to write down the recovery seeds offline but wrote them in a document in my computer.
Are you sure that you wrote them in a document? because you can easily find all the docs on your PC by using the search button and adding the keyword "*.doc" without quotes.
If the search button in your Windows computer does not work try to download software called "Everything" from voidtools and use that software to search all docs using the keyword above.
Once you found all the docs check them one by one if you could find your backup seed phrase.