Here is an analysis of what such a file represents and how to handle it. Introduction to the RAR Format
If the file fails to open, it may be a "multi-volume" archive (e.g., 55377.part1.rar , 55377.part2.rar ) or a "self-extracting" archive (SFX) ending in .exe . Potential Content Context 55377.rar
RAR files support optional encryption, meaning the file 55377.rar may require a password to extract. Here is an analysis of what such a