Based on common file naming trends, here are the likely purposes for a "BlitzV13" file:
It might contain scripts to automate tasks in a game. How to Safely Handle This File BlitzV13.rar
Use VirusTotal to analyze the file before opening it. Based on common file naming trends, here are
this file from untrusted sources, forums, or discord links. Based on common file naming trends
Often, these files are trainers for games, aimed at giving users an advantage (e.g., speed hacks, aimbots).