How many and what type are they, and how do you think they got there. What is the folder called?
Did you create it?
If you don't want them just delete them, but if it was me I would like to know what happened if it was not a deliberate action of mine.
If they are all of the same type they may be backups created by a program. Do you know where the originals are?
Try checking date and time etc. It might remind you of something.