unknown_file.jar

unknown_file.jar

It's me.

by
1.4K Downloads
neoforgeadventurecursedworldgen
Rent Server with this Mod

Screenshots

ITS ME
BSOD
YOU NEVER NOTICED ME
moon

About this Mod

UNKNOWN_FILE.JAR

something wanders where it shouldn't in a world where you don't belong

One of this mods entities, Moon Eater, stalking the player

unknown_file.jar is a RANDOM progression horror mod that slowly corrupts your world (it isn't really slow lmao), while you uncover the secrets of its dark past. This mod sends you back to the alpha versions of minecraft, but things feel really odd. People who don't belong join, world corrupts itself slowly while it tries to kick you out. (I put it as random progression because in current versions of the mod you can get pretty much any heavy event after Shadow joins)

Some things on the mod still don't work as intended and/or will be given use in the future. Its recomended that you don't play with any other mod that changes terrain generation or any other horror mod for the best experience. Its on you though!
WARNING:
This mod can:

  • erase your worlds
  • ban you from worlds
  • create popups
  • forcefully crash or close the game

CREDITS:

  • Alpha/Classic textures from Golden Days Alpha
  • Modern Beta for the testing of the no hunger stuff
  • Some assets from Scott Cawthon games (might change in future versions)
  • nicopatty for the HERE I COME remix used for Corrupter's WIP fight, go check it out here:D

NOW ON CURSEFORGE! CHECK IT OUT:
https://www.curseforge.com/minecraft/mc-mods/unknown-file-jar

JOIN OUR DISCORD!
https://discord.gg/QfyZE8pZdW

Available Versions

unknown_file.jar beta 0.1.8beta
MC 1.21.1neoforge
June 3, 2026
unknown_file.jar beta 0.1.7beta
MC 1.21.1neoforge
May 30, 2026
unknown_file.jar beta 0.1.6beta
MC 1.21.1neoforge
May 28, 2026
unknown_file.jar beta 0.1.5beta
MC 1.21.1neoforge
May 19, 2026
unknown_file.jar 0.1.4alpha
MC 1.21.1neoforge
February 25, 2026

How to Install unknown_file.jar on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "unknown_file.jar". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.1

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

unknown_file.jar server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is unknown_file.jar compatible with neoforge?

unknown_file.jar officially supports neoforge for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with unknown_file.jar – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if unknown_file.jar consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install unknown_file.jar with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.1