diff --git a/local-tool/Makefile b/local-tool/Makefile
index bc0b195..5270df5 100644
--- a/local-tool/Makefile
+++ b/local-tool/Makefile
@@ -470,6 +470,8 @@ exe-only: ## 只跑 iscc 打包 installer（前置產物必須已存在），不
 exe: wails-windows _run-iscc ## ⚠️ 必須在 Windows 上跑：Inno Setup → dist/visiona-local-*-windows-x64.exe
 
 _run-iscc:
+	@echo "DEBUG _run-iscc: ISCC='$$ISCC'"
+	@echo "DEBUG _run-iscc: PATH first entries: $$(echo $$PATH | tr ':' '\n' | head -5)"
 	@ISCC_BIN="$$ISCC"; \
 	if [ -z "$$ISCC_BIN" ]; then \
 		if command -v iscc > /dev/null 2>&1; then ISCC_BIN=iscc; \
diff --git a/local-tool/scripts/bootstrap-windows.ps1 b/local-tool/scripts/bootstrap-windows.ps1
index 4fadc75..d135c5f 100644
--- a/local-tool/scripts/bootstrap-windows.ps1
+++ b/local-tool/scripts/bootstrap-windows.ps1
@@ -204,10 +204,25 @@ if ($fastPath -and ($Target -eq 'exe' -or -not $env:VISIONA_TARGET)) {
     }
 }
 
-$bashCmd = $bashParts -join ' && '
+# 把 bash 指令寫成 script 檔再執行，避開 PS → bash 多層 quoting 地獄
+# （尤其是含空格的路徑如 "C:\Program Files (x86)\Inno Setup 6\"）
+$bashScriptLines = @('#!/usr/bin/env bash', 'set -e', '')
+foreach ($line in $bashParts) {
+    $bashScriptLines += $line
+}
+$bashScriptContent = ($bashScriptLines -join "`n") + "`n"
+$tmpScript = Join-Path (Get-Location) '.visiona-build.sh'
+# 用 UTF8 無 BOM + LF 換行，bash 才吃得下
+[System.IO.File]::WriteAllText($tmpScript, $bashScriptContent, (New-Object System.Text.UTF8Encoding $false))
 
-& 'C:\msys64\usr\bin\bash.exe' -lc $bashCmd
-if ($LASTEXITCODE -ne 0) { Fail "build 失敗，exit code=$LASTEXITCODE" }
+Log "bash 執行腳本內容："
+Get-Content $tmpScript | ForEach-Object { Write-Host "    $_" }
+
+$msysScript = Convert-ToMsysPath $tmpScript
+& 'C:\msys64\usr\bin\bash.exe' -l $msysScript
+$buildRc = $LASTEXITCODE
+Remove-Item $tmpScript -ErrorAction SilentlyContinue
+if ($buildRc -ne 0) { Fail "build 失敗，exit code=$buildRc" }
 
 # 驗證 dist 真的有 .exe 產出（exe target 是 phony，make 成功 != 產物存在）
 if ($Target -eq 'exe' -or $Target -eq 'default' -or -not $Target) {