File: Goat.simulator.3.v1.0.1.3.zip ... -

The numbers at the end of the filename are "version tags" used to track the game's development:

Because Goat Simulator 3 is a paid commercial product, files found with this naming convention on third-party websites or peer-to-peer networks often carry risks. If you didn't download this from an official store (like Epic Games, Steam, or Xbox), it's highly recommended to scan it with antivirus software before opening, as zip files from unofficial sources are common vectors for malware. File: Goat.Simulator.3.v1.0.1.3.zip ...

Backup installers from DRM-free sites (like GOG). The numbers at the end of the filename

Community-led projects that preserve specific versions of games so players can revisit "day-one" glitches or play on older hardware that might not support newer updates. File: Goat.Simulator.3.v1.0.1.3.zip ...

: Indicates the "Gold" or full release version of the game.