If the RAR requires a password that sends you to a survey or a second website, it is almost certainly a scam.
Files with randomized names are often used for: Fdgfbhfhfgfgfg rar
Unless you specifically requested this file from a person you trust, treat "Fdgfbhfhfgfgfg.rar" as highly suspicious. Better to lose a mystery file than to lose your data! If the RAR requires a password that sends
Sometimes developers or uploaders use temporary names during a bulk upload. Fdgfbhfhfgfgfg rar