How to Find files via relative path

I wanna have a thing in my game where it will detect a if you have a file on your computer either nearby the exe or maybe not that will then unlock something in the game. Any ideas on how i can add this in UE 4.27?

You can utilize a Plugin/Blueprint Library that includes file utilities. For instance, there is a free plugin available that allows you to manage files in Unreal.

Unfortunetly that seems to only support unreal engine 5. I’m using unreal engine 4.27 are there any other plugins like this that supports ue 4.27?