From e9eaf24949474630125f05562ecfd0f48acb3493 Mon Sep 17 00:00:00 2001
From: kisakay <kisakay@kisakay.com>
Date: Sun, 18 Oct 2026 19:13:18 +0200
Subject: [PATCH] Launcher: fix natives MC 26.x (sous-dossiers
 java/jna/lwjgl/netty, extraction vers java/)

---
 launcher/app/assets/js/processbuilder.js | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/launcher/app/assets/js/processbuilder.js b/launcher/app/assets/js/processbuilder.js
index a0bdb0f..9cf5cd0 100644
--- a/launcher/app/assets/js/processbuilder.js
+++ b/launcher/app/assets/js/processbuilder.js
@@ -719,6 +719,12 @@ class ProcessBuilder {
 
         const libArr = this.vanillaManifest.libraries
         fs.ensureDirSync(tempNativePath)
+        // Mojang (1.20.5+) attend des sous-dossiers : ${natives_directory}/java (java.library.path),
+        // /jna, /lwjgl, /netty (extraction runtime). Sans eux -> "not a directory" -> crash LWJGL.
+        // (SurviePote : correctif layout natives MC 26.x, Helios 2.x extrayait à plat.)
+        for(const sub of ['java', 'jna', 'lwjgl', 'netty']){
+            fs.ensureDirSync(path.join(tempNativePath, sub))
+        }
         for(let i=0; i<libArr.length; i++){
             const lib = libArr[i]
             if(isLibraryCompatible(lib.rules, lib.natives)){
@@ -799,13 +805,16 @@ class ProcessBuilder {
 
                         const extractName = fileName.includes('/') ? fileName.substring(fileName.lastIndexOf('/')) : fileName
 
-                        // Extract the file.
+                        // Extract the file (racine pour compat + sous-dossier java/ exigé par MC récent).
                         if(!shouldExclude){
-                            fs.writeFile(path.join(tempNativePath, extractName), zipEntries[i].getData(), (err) => {
-                                if(err){
-                                    logger.error('Error while extracting native library:', err)
-                                }
-                            })
+                            const data = zipEntries[i].getData()
+                            for(const dest of [path.join(tempNativePath, extractName), path.join(tempNativePath, 'java', extractName)]){
+                                fs.writeFile(dest, data, (err) => {
+                                    if(err){
+                                        logger.error('Error while extracting native library:', err)
+                                    }
+                                })
+                            }
                         }
 
                     }