The file does not appear to be a widely known or officially documented software package or data set. The .7z extension indicates it is a compressed archive created with 7-Zip . Understanding the File Type
: If you receive a "Data Error" or "CRC Error" when trying to open it, the file may be corrupted. 7z get total size of uncompress contents? - Stack Overflow
Since "FLELS103" is likely a custom name given by its creator, a "review" of the archive's quality or safety depends on its specific contents.
: The .7z format uses the LZMA algorithm , often providing 30–50% better compression than standard ZIP files.