diff --git a/build_windows.ps1 b/build_windows.ps1
index b43ba0b..46f7349 100644
--- a/build_windows.ps1
+++ b/build_windows.ps1
@@ -70,6 +70,16 @@ if (-not (Test-Path src-tauri\vc_redist.x64.exe)) {
 }
 
 Write-Host "== [6/6] Tauri build (NSIS .exe + MSI) =="
+# Guard: resources/daw_engine PHẢI có exe + _internal trước khi tauri build —
+# glob trong tauri.conf.json fail ngay ("path not found") neu thieu.
+if (-not (Test-Path "src-tauri\resources\daw_engine\daw_engine.exe")) {
+  Write-Host "ERROR: src-tauri\resources\daw_engine\daw_engine.exe khong co — buoc [4/6] that bai?" -ForegroundColor Red
+  exit 1
+}
+if (-not (Test-Path "src-tauri\resources\daw_engine\_internal")) {
+  Write-Host "ERROR: thieu src-tauri\resources\daw_engine\_internal (onedir khong day du)" -ForegroundColor Red
+  exit 1
+}
 npm install -D @tauri-apps/cli
 npx tauri build