diff --git a/src/main/browser/external.ts b/src/main/browser/external.ts
index 76b1c97..8d93f1a 100644
--- a/src/main/browser/external.ts
+++ b/src/main/browser/external.ts
@@ -52,7 +52,7 @@ const BROWSER_CANDIDATE_PATHS: Record<ExternalBrowserType, string[]> = {
   chrome: [
     "C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe",
     "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe",
-    path.join(process.env.LOCALAPPDATA ?? "", "Google", "Chrome", "Application", "chrome.exe")
+    path.join(localAppDataDir(), "Google", "Chrome", "Application", "chrome.exe")
   ],
   edge: [
     "C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe",
@@ -60,9 +60,24 @@ const BROWSER_CANDIDATE_PATHS: Record<ExternalBrowserType, string[]> = {
   ]
 };
 
-const BROWSER_APP_PATHS_REGISTRY: Record<ExternalBrowserType, string> = {
-  chrome: "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe",
-  edge: "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\msedge.exe"
+/** 用户级 AppData\Local 目录；LOCALAPPDATA 缺失（如受限启动环境）时退回 USERPROFILE 拼接 */
+function localAppDataDir(): string {
+  if (process.env.LOCALAPPDATA) return process.env.LOCALAPPDATA;
+  return path.join(os.homedir(), "AppData", "Local");
+}
+
+/** 注册表 App Paths 兜底：HKLM（64 位 + WOW6432Node）与 HKCU（用户级安装）都查 */
+const BROWSER_APP_PATHS_REGISTRIES: Record<ExternalBrowserType, string[]> = {
+  chrome: [
+    "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe",
+    "HKLM\\SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe",
+    "HKCU\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe"
+  ],
+  edge: [
+    "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\msedge.exe",
+    "HKLM\\SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\App Paths\\msedge.exe",
+    "HKCU\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\msedge.exe"
+  ]
 };
 
 async function fileExists(p: string): Promise<boolean> {
@@ -84,20 +99,22 @@ function queryRegistry(command: string): Promise<string> {
   });
 }
 
-/** 探测本机浏览器安装路径：常见目录优先，注册表 App Paths 兜底 */
+/** 探测本机浏览器安装路径：常见目录优先，注册表 App Paths（HKLM/HKCU）兜底 */
 export async function detectBrowserPath(browserType: ExternalBrowserType): Promise<string> {
   for (const candidate of BROWSER_CANDIDATE_PATHS[browserType]) {
     if (await fileExists(candidate)) return candidate;
   }
-  try {
-    const stdout = await queryRegistry(BROWSER_APP_PATHS_REGISTRY[browserType]);
-    const match = stdout.match(/REG_SZ\s+(\S[^\r\n]*)/);
-    if (match) {
-      const registryPath = match[1].trim();
-      if (await fileExists(registryPath)) return registryPath;
+  for (const registryKey of BROWSER_APP_PATHS_REGISTRIES[browserType]) {
+    try {
+      const stdout = await queryRegistry(registryKey);
+      const match = stdout.match(/REG_SZ\s+(\S[^\r\n]*)/);
+      if (match) {
+        const registryPath = match[1].trim();
+        if (await fileExists(registryPath)) return registryPath;
+      }
+    } catch {
+      // 该键不存在继续查下一个
     }
-  } catch {
-    // 注册表查询失败继续走报错
   }
   throw new RuntimeError(
     "browser_not_found",