It is often associated with custom modifications (mods), replays, or "champion" builds for strategy games (like Age of Empires or League of Legends ).
Compressed files like .rar archives are a common way to distribute software, but they are also a preferred method for spreading malware because the contents are hidden until extracted. Before opening AgrChamp.rar, consider these steps: AgrChamp.rar
Disclaimer: This post is for informational purposes. Always use updated antivirus software when handling files from the internet. It is often associated with custom modifications (mods),