diff --git a/client/src/main.js b/client/src/main.js
index 88c3c4e..1700bd5 100644
--- a/client/src/main.js
+++ b/client/src/main.js
@@ -43,7 +43,12 @@ function loadConfig() {
     console.log(`Checking: ${configPath} - exists: ${exists}`);
     try {
       if (exists) {
-        const configData = fs.readFileSync(configPath, "utf-8");
+        // Use utf-8 and strip BOM if present (Windows Notepad adds BOM)
+        let configData = fs.readFileSync(configPath, "utf-8");
+        // Remove UTF-8 BOM if present
+        if (configData.charCodeAt(0) === 0xFEFF) {
+          configData = configData.slice(1);
+        }
         appConfig = JSON.parse(configData);
         console.log("Config loaded from:", configPath);
         console.log("Config content:", JSON.stringify(appConfig, null, 2));
diff --git a/scripts/build-client.bat b/scripts/build-client.bat
index 5c6d9e1..b0b1fbb 100644
--- a/scripts/build-client.bat
+++ b/scripts/build-client.bat
@@ -313,8 +313,8 @@ if not exist "%CONFIG_FILE%" (
     goto :eof
 )
 
-REM 使用 PowerShell 更新 backend.embedded = true
-powershell -Command "$config = Get-Content '%CONFIG_FILE%' -Raw | ConvertFrom-Json; if (-not $config.backend) { $config | Add-Member -NotePropertyName 'backend' -NotePropertyValue @{} }; $config.backend.embedded = $true; $config | ConvertTo-Json -Depth 10 | Set-Content '%CONFIG_FILE%' -Encoding UTF8"
+REM 使用 PowerShell 更新 backend.embedded = true (使用 UTF8 without BOM)
+powershell -Command "$config = Get-Content '%CONFIG_FILE%' -Raw | ConvertFrom-Json; if (-not $config.backend) { $config | Add-Member -NotePropertyName 'backend' -NotePropertyValue @{} }; $config.backend.embedded = $true; $json = $config | ConvertTo-Json -Depth 10; [System.IO.File]::WriteAllText('%CONFIG_FILE%', $json, [System.Text.UTF8Encoding]::new($false))"
 
 if errorlevel 1 (
     echo %RED%[ERROR]%NC% 更新 config.json embedded 設定失敗