Anyone else with Avira blocks host file when you launch game?

Every time I launch game, Avira blocks a host file. Game still runs fine with file blocked. Anyone know what file this is, and should I be worried?

Without knowing the specific file being blocked, no one can really sat anything about whether it is bad or not. One thing to note, however, is that it is always best to disable ALL Anti-Virus programs before plaiing an MMO. They can cause issues with them in the long run.