
Modrinth · Minecraft mod
PackCENHeaderFix
There is no longer an error `invalid CEN header (bad entry name or comment)
Quick answer
Which PackCENHeaderFix release matches 25w09a?
PackCENHeaderFix 0.0.4+1.21.8 targets 1.20.6, 24w18a, 24w19a with Fabric, Quilt. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is PackCENHeaderFix required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does PackCENHeaderFix 0.0.4+1.21.8 need?
0.0.4+1.21.8 on 25w09a. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add PackCENHeaderFix without breaking your instance.
Built for PackCENHeaderFix 0.0.4+1.21.8 on 25w09a. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 0.0.4+1.21.8. It targets 1.20.6, 24w18a, 24w19a with Fabric, Quilt; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 0.0.4+1.21.8. It opens that exact file at the source.
About this project
What does PackCENHeaderFix add?
PackCENHeaderFix
There is no longer an error invalid CEN header (bad entry name or comment)
It solves this problem by replacing Java Zip implementation with Apache Commons Compress implementation.
Example Story
You downloaded a ResourcePack from a RP author. You put it in your RP folder and tried to load it as usual, but you don't see it in the RP selector.
Instead, Minecraft prints the following error in the log:

It doesn't appear in Mojira, precisely because it's a bug that only appears under very extreme conditions. I haven't seen it in the past few years of the game, and only very, very few RP authors have accidentally allowed their RP to be contaminated by this bug.
The cause of this bug is unknown, but it only affects the Java Zip implementation. RPs that experience this bug can still be force-loaded (although you won't be able to find them in the selector), but I think it's better to try to fix it.
About API
It's intended for use with another mod of mine, which will rely on this one for additional functionality.
If you want to do something with it, my advice is don't, I don't want it to behave unexpectedly.
How to build?
After the clone repository, be sure to use the ./gradlew clean build command to build,
rather than executing any of them separately.
After the build is completed, a jars folder will be generated in the root directory,
where the final build results will be stored.
For Modpack
If you comply with the license, you can use it freely for Modpack.
Modpacks that redistribute Minecraft game body (i.e. packages that package the entire Minecraft game including Mod files, Config, ShaderPacks, ResourcePacks, Library and launcher into a whole zip file) are not allowed to use this mod.
License
This work has a restrictive license in addition to the original license to prevent some unexpected behavior, see 404Setup Public License
Project description from Modrinth.
Pick your setup
PackCENHeaderFix by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.1
2 loader builds25w44a
2 loader builds25w43a
2 loader builds25w42a
2 loader builds25w41a
2 loader builds25w37a
2 loader builds25w36b
2 loader builds25w36a
2 loader builds25w35a
2 loader builds25w34b
2 loader builds25w34a
2 loader buildsShowing the newest 12 of 101 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
PackCENHeaderFix versions and loaders
0.0.4+1.21.8
pchf-fabric-1.21.8-0.0.4+1.21.8.jar
19 Aug 2025
Looking for an older file? The official Modrinth project page is in Resources.