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. SpaceEngine.v0.990.45.1940.part03.rar
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? The string v0
Downloading split RAR parts from unofficial sources carries a high risk of containing malware or bundled "adware." observe atmospheric effects