: This is the specific build version. The "4392638" is likely a "Changelist" or "Build ID," a digital fingerprint used by developers and distribution platforms like the Epic Games Store to track exactly which version of the game's code is being used.
"Part 05" is essentially a middle chapter of the game's data. It likely contains a mix of encrypted textures, character models for the Santo Ileso desert, or perhaps a portion of the game's radio station audio files. Without the other parts (Part 01, Part 02, etc.), this file is a useless fragment; but together, they form the complete interactive experience. 4. The Legacy of Version 1.1.6 SaintsRow v1.1.6.4392638.part05.rar
A file named exactly like this is most commonly associated with or repacks . In the world of software archiving, groups take the raw game files, apply the latest patches (in this case, version 1.1.6), and package them into these .rar volumes for the community. : This is the specific build version
Instead, they are "split" into smaller chunks (like this 5th part). This serves three practical purposes: It likely contains a mix of encrypted textures,