If you're looking to modify Minecraft version 1.6.1 to make passive mobs hostile, here’s an overview of how you can achieve this by editing the game’s class files. However, note that modifying the game files can be complex and may violate the End User License Agreement (EULA). Proceed at your own discretion.

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Steps to Make Passive Mobs Hostile in Minecraft 1.6.1

1. Setup Required Tools:
   
   • Java Development Kit (JDK): Install the JDK to work with Minecraft's .class files.
   • Minecraft Coder Pack (MCP): MCP can decompile Minecraft's files and allow you to edit them.
   • IDE (like IntelliJ or Eclipse): Makes editing Java code easier.
   • Obfuscation Mapping for 1.6.1: You’ll need this to understand Minecraft’s obfuscated class names.
2. Decompile the Game Files:
   
   • Use MCP to decompile the Minecraft 1.6.1 .jar file.
   • Locate the EntityAnimal class, which controls passive mob behavior.
3. Modify the AI Behavior:
   
   • 
     Find the methods that define mob behavior. Look for methods like onLivingUpdate or attackEntityFrom.
     
   • 
     Add hostile behavior by overriding the AI. For example, you can modify onLivingUpdate to target the nearest player:
     javaCopy code@Override
public void onLivingUpdate() {
super.onLivingUpdate();
EntityPlayer player = this.worldObj.getClosestPlayerToEntity(this, 10.0D);
if (player != null) {
this.attackEntity(player, this.getAttackStrength());
}
}

   • 
     Implement additional methods for the mob to deal damage.
     
4. Recompile and Test:
   
   • Use MCP to recompile your modified files.
   • Replace the modified .class files in the original Minecraft .jar.
5. Run and Verify:
   
   • Launch the game and observe if passive mobs like cows, chickens, or sheep exhibit hostile behavior.

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Challenges and Considerations:

• Backup Your Files: Always create backups of the original files before editing.
• Understand Obfuscation: Minecraft’s source code is obfuscated, so class and method names may not be intuitive.
• Legal Note: Modifying Minecraft files directly might breach Mojang’s EULA, so ensure you’re aware of the implications.
• Use MCP Properly: Ensure the decompilation and recompilation process is error-free.

If you’re looking for a ready-made .class file, you might need to rely on others who’ve worked on a similar project, though sharing pre-modified game files is often restricted.


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Interesting question…

One wonders if it might not be easier to add hostile mobs that duplicated (other than behaviors) various passives (rather than overwriting them)….