diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 03de2be26..f713ceeca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,6 +51,9 @@ jobs:
       - name: TypeScript type check
         run: pnpm run typecheck:ts
 
+      - name: Pack helper tests
+        run: pnpm run scripts:test
+
   test-python:
     name: Python Tests (${{ matrix.os }})
     runs-on: ${{ matrix.runner }}
diff --git a/electron-builder.yml b/electron-builder.yml
index b6d1e0783..17b983ae6 100644
--- a/electron-builder.yml
+++ b/electron-builder.yml
@@ -16,7 +16,13 @@ files:
 
 asarUnpack:
   - dist/splash/**
-  - node_modules/koffi/**
+  # koffi 3.x loads ../../@koromix/koffi-${platform}-${arch} from its JS.
+  # Unpack that package so require() can load the .node from disk, not asar.
+  - node_modules/@koromix/**/*
+
+# Also copy the .node to resources/koffi/${platform}_${arch}/ (Koffi's Electron
+# lookup). Pack fails if the optional native package is missing on the builder.
+afterPack: scripts/copy-koffi-native.cjs
 
 extraResources:
   - from: backend
diff --git a/electron/win-dll-search.ts b/electron/win-dll-search.ts
index bb17a25a5..ea6de3ced 100644
--- a/electron/win-dll-search.ts
+++ b/electron/win-dll-search.ts
@@ -9,15 +9,21 @@ export function removeCwdFromDllSearchPath(): void {
     return
   }
 
-  const require = createRequire(import.meta.url)
-  const koffi = require('koffi') as {
-    load: (name: string) => { func: (sig: string) => (...args: unknown[]) => unknown }
-  }
-  const kernel32 = koffi.load('kernel32.dll')
-  const setDllDirectoryW = kernel32.func('int SetDllDirectoryW(str16)')
-  const ok = setDllDirectoryW('')
-  if (!ok) {
-    console.error('[LTX Desktop] SetDllDirectoryW("") failed')
+  try {
+    const require = createRequire(import.meta.url)
+    const koffi = require('koffi') as {
+      load: (name: string) => { func: (sig: string) => (...args: unknown[]) => unknown }
+    }
+    const kernel32 = koffi.load('kernel32.dll')
+    const setDllDirectoryW = kernel32.func('int SetDllDirectoryW(str16)')
+    const ok = setDllDirectoryW('')
+    if (!ok) {
+      console.error('[LTX Desktop] SetDllDirectoryW("") failed')
+    }
+  } catch (err) {
+    // Missing/blocked koffi.node must not take down the app. Python still
+    // clears CWD from its own DLL search via PY_REMOVE_CWD_FROM_DLL_SEARCH.
+    console.error('[LTX Desktop] Failed to clear the Windows DLL search path', err)
   }
 }
 
diff --git a/package.json b/package.json
index b60c0685d..5a2247709 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ltx-desktop",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "LTX-2 Video Generation - Desktop App",
   "type": "module",
   "main": "dist-electron/main.js",
@@ -26,6 +26,7 @@
     "openapi:generate": "pnpm openapi:export && pnpm openapi:types",
     "openapi:check": "pnpm openapi:generate && git diff --exit-code -- frontend/generated/backend-openapi.json frontend/generated/backend-openapi.ts",
     "backend:test": "cd backend && uv sync --frozen --extra test --extra dev && uv run pytest -v --tb=short",
+    "scripts:test": "node --test scripts/copy-koffi-native.test.cjs",
     "build": "node scripts/run-script.js scripts/local-build",
     "build:skip-python": "node scripts/run-script.js scripts/local-build --skip-python",
     "build:fast": "node scripts/run-script.js scripts/local-build --unpack --skip-python",
diff --git a/scripts/copy-koffi-native.cjs b/scripts/copy-koffi-native.cjs
new file mode 100644
index 000000000..5b5356c00
--- /dev/null
+++ b/scripts/copy-koffi-native.cjs
@@ -0,0 +1,75 @@
+#!/usr/bin/env node
+// electron-builder afterPack: copy Koffi's platform .node next to the app so
+// packaged Windows (and other OS) builds can load it.
+//
+// koffi 3.x keeps the native addon in an optional sibling package
+// (@koromix/koffi-${platform}-${arch}), not inside node_modules/koffi. Packing
+// koffi/** therefore ships JS/headers only. At runtime Koffi searches
+// process.resourcesPath/koffi/${platform}_${arch}/koffi.node — copy there.
+// electron-builder also asarUnpacks node_modules/@koromix/** as a second path.
+'use strict'
+
+const fs = require('node:fs')
+const path = require('node:path')
+const { createRequire } = require('node:module')
+
+const ARCH_NAMES = ['ia32', 'x64', 'armv7l', 'arm64', 'universal']
+
+function archName(arch) {
+  if (typeof arch === 'string') {
+    return arch
+  }
+  return ARCH_NAMES[arch] ?? String(arch)
+}
+
+function koffiNativeDest(resourcesDir, platform, arch) {
+  const triplet = `${platform}_${archName(arch)}`
+  return path.join(resourcesDir, 'koffi', triplet, 'koffi.node')
+}
+
+function resourcesDir(context) {
+  const packager = context.packager
+  if (typeof packager.getResourcesDir === 'function') {
+    return packager.getResourcesDir(context.appOutDir)
+  }
+  if (context.electronPlatformName === 'darwin') {
+    const name = packager.appInfo.productFilename
+    return path.join(context.appOutDir, `${name}.app`, 'Contents', 'Resources')
+  }
+  return path.join(context.appOutDir, 'resources')
+}
+
+function resolveKoffiNativeSrc(projectDir, platform, arch) {
+  const pkgName = `@koromix/koffi-${platform}-${archName(arch)}`
+  // koffi's exports map does not include ./package.json — resolve the entry.
+  const fromProject = createRequire(path.join(projectDir, 'package.json'))
+  const koffiEntry = fromProject.resolve('koffi')
+  const fromKoffi = createRequire(koffiEntry)
+  const nativeEntry = fromKoffi.resolve(pkgName)
+  const src = path.join(path.dirname(nativeEntry), `${platform}_${archName(arch)}`, 'koffi.node')
+  if (!fs.existsSync(src)) {
+    throw new Error(`Koffi native binary missing at ${src} (package ${pkgName})`)
+  }
+  return src
+}
+
+async function copyKoffiNative(context) {
+  const platform = context.electronPlatformName
+  const arch = archName(context.arch)
+  const projectDir = context.packager.projectDir
+  const dest = koffiNativeDest(resourcesDir(context), platform, arch)
+  const src = resolveKoffiNativeSrc(projectDir, platform, arch)
+
+  fs.mkdirSync(path.dirname(dest), { recursive: true })
+  fs.copyFileSync(src, dest)
+  console.log(`[copy-koffi-native] ${src} → ${dest}`)
+}
+
+module.exports = {
+  default: copyKoffiNative,
+  archName,
+  koffiNativeDest,
+  resourcesDir,
+  resolveKoffiNativeSrc,
+  copyKoffiNative,
+}
diff --git a/scripts/copy-koffi-native.test.cjs b/scripts/copy-koffi-native.test.cjs
new file mode 100644
index 000000000..7894300ec
--- /dev/null
+++ b/scripts/copy-koffi-native.test.cjs
@@ -0,0 +1,54 @@
+'use strict'
+
+const assert = require('node:assert/strict')
+const path = require('node:path')
+const { describe, it } = require('node:test')
+const { archName, koffiNativeDest, resourcesDir } = require('./copy-koffi-native.cjs')
+
+describe('archName', () => {
+  it('passes string arch through', () => {
+    assert.equal(archName('x64'), 'x64')
+  })
+
+  it('maps electron-builder Arch enum integers', () => {
+    assert.equal(archName(1), 'x64')
+    assert.equal(archName(3), 'arm64')
+  })
+})
+
+describe('koffiNativeDest', () => {
+  it('matches Koffi resourcesPath lookup win32_x64/koffi.node', () => {
+    assert.equal(
+      koffiNativeDest(path.join('app', 'resources'), 'win32', 'x64'),
+      path.join('app', 'resources', 'koffi', 'win32_x64', 'koffi.node'),
+    )
+  })
+})
+
+describe('resourcesDir', () => {
+  it('uses packager.getResourcesDir when present', () => {
+    const dir = resourcesDir({
+      appOutDir: '/out',
+      packager: { getResourcesDir: (appOutDir) => `${appOutDir}/R` },
+    })
+    assert.equal(dir, '/out/R')
+  })
+
+  it('falls back to Contents/Resources on darwin', () => {
+    const dir = resourcesDir({
+      appOutDir: '/out',
+      electronPlatformName: 'darwin',
+      packager: { appInfo: { productFilename: 'LTX Desktop' } },
+    })
+    assert.equal(dir, path.join('/out', 'LTX Desktop.app', 'Contents', 'Resources'))
+  })
+
+  it('falls back to resources/ on win32', () => {
+    const dir = resourcesDir({
+      appOutDir: '/out',
+      electronPlatformName: 'win32',
+      packager: { appInfo: { productFilename: 'LTX Desktop' } },
+    })
+    assert.equal(dir, path.join('/out', 'resources'))
+  })
+})