If the archive requires a password (often provided in a separate .txt file or on a suspicious website), it is likely designed to hide its contents from being scanned by your antivirus software.
Many "trainers" found on obscure forums or file-sharing sites are actually trojans or keyloggers. Because trainers work by "injecting" code into another process, antivirus software often flags them—a fact that hackers use to convince users to disable their security. Saints-Row-TRNT.rar
A "repack" or pirate copy of the game compressed into a RAR format to save space. Why you should be careful If the archive requires a password (often provided