To help you find the "piece" (likely a missing part of a multi-volume archive or a specific password/key), could you clarify a few details?
Be cautious if this file was downloaded from an untrusted source. RAR files with cryptic hexadecimal names are sometimes used to distribute malware or unwanted software. dc87a445955547ac9d2ac1829784ea86.rar
If this is part of a set, what are the names of the other files you already have? (e.g., .part1.rar , .part2.rar ). To help you find the "piece" (likely a
Is this part of a software package, a game mod, or a private data backup? a game mod