The file extension refers to a compressed archive created with the free, open-source program 7-Zip .
: Many creators use 7z to bundle high-compression game modifications or textures. hyposleds.7z
While there is no public record of a mainstream software or project by this exact name, the naming convention suggests it is a custom archive. Based on common uses for such files, it likely falls into one of these categories: The file extension refers to a compressed archive
To access the "piece" of content inside this archive, you will need a utility that supports the .7z format. Archive your software to Software Heritage - Zenodo hyposleds.7z