Uses various algorithms, most notably LZMA and LZMA2 , which offer advanced data reduction.
Based on your request, "SIYM.7z" appears to be a compressed archive file using the format. SIYM.7z
To view the contents of SIYM.7z , you will need a file archiver that supports the format. Common options include: Uses various algorithms, most notably LZMA and LZMA2