At.rar - Google | Drive

The file on Google Drive is a compressed archive format used to group and shrink multiple files into a single, smaller package. While "AT" could stand for many things depending on the sender—such as a specific project name or "All-Trans" in scientific contexts—it is also associated with Trojan.BtcMine malware in some technical security databases. Understanding RAR Files in Google Drive How To Open A RAR File In Google Drive