It typically uses the LZMA or LZMA2 algorithms.
The file is a 7-Zip compressed archive. While there is no single, famous public document or piece of software officially named "Rs_133," the .7z extension identifies it as a high-compression archive created by or compatible with 7-Zip . Rs_133.7z
If it asks for a password, the archive is encrypted. You will need to obtain the key from the original source. It typically uses the LZMA or LZMA2 algorithms
This often indicates the download was interrupted, leaving the file incomplete. 4. Advanced: Command Line Usage Rs_133.7z