Ripers? Don’t know who they are?
It’s “Technic, RITUEL! Myth/Dynasty etc” these guys use the same compression method often and that is UHARC Compression, Worlds best compression when compared with others (KGB Compressors compression and extraction Takes more time!) UHARC was developed by Uwe Herklotz and have highest compression ratio!! You can either get the Win UHARC which supports SFX or UHARC/GUI which don’t have an SFX option but comes with the latest released version of UHARC. The Compression Methods can be changed accordingly to your system configuration.
The main drawback of UHARC is that it takes time when extracting large files when compared with 7zip, RAR, Zip or ARC,