My recommendation to you is to install
Search Everything. Just use the "download installer" button on that page if you're not sure what to choose.
Once you install that and load it up, type "harvestmap" into the search field and press enter. Give it a few seconds.
If anything is found, click on one, press Ctrl+A to select everything, and then press your Del key to delete all.
Do this with the game CLOSED.