A text file folder exists for this group ???

Just updated to EE 2.10.1 and am pruning old Templates and Template Groups that are no longer used. Just received the following notice when attempting to delete a Template Group named, “serviceform”

Delete the following template group?

serviceform

A text file folder exists for this group. 
The folder and all contents will be automatically deleted as part of this action.

I’ve been working with EE since it was called pMachine. I’ve never seen this notice and Google search doesn’t return anything except instances of this in different EN Lang files.

What is a “text file folder” and how do I locate it and ensure that deleting this Template Group doesn’t screw something else up