EULA's are most likely End-User License Agreements (those big legal blobs of text that no one reads, and you click "accept" otherwise the program won't install).
Did you find this in some program's folder? If so, that's probably the EULA for that program. If you delete it, at worst, the program might stop working.
I think more importantly is the fact that these are text documents. Even if you delete them, you're likely to free up less than a single megabyte (1 MB) of space. If you're trying to clean out hard drive space, deleting these txt documents honestly will get you nowhere.
My point is that there's no reason to delete them.