File download

I’ve noticed today a file I no nothing about or what it means etc that’s worried me ......particularly the size which is 278 bytes it reads...changed-Ua-set of hosts-x-carchive. Anybody offer me some information as to what it is..and what to do with it etc...please bare in mind that I’m only a learner and getting on in years so simple as possible would be great.I’m using an Apple iPad 8th generation.Any offers much appreciated thank you.....ps my iCloud free account is almost full..eevet