Files with this specific naming convention—especially those found on third-party file-sharing sites or forums—are often associated with of the software.
The string v0.990.45.1940 identifies a specific beta or early-access build of SpaceEngine. About SpaceEngine
You can land on planets, observe atmospheric effects, and view celestial phenomena like black holes and nebulae with scientifically accurate visuals.
Because this is part of a split RAR archive (indicated by .part03 ), you cannot open or use it as a standalone file. Here is the essential context regarding this file type and the software: What is this file?
SpaceEngine is a "procedural universe" simulator that allows you to explore the cosmos at a 1:1 scale.
Downloading split RAR parts from unofficial sources carries a high risk of containing malware or bundled "adware."
If even one part (like part01 or part02) is missing or corrupted, the entire installation will fail to extract.