diff --git a/Source/Modules/WindowControllers/CtlClientListMgr.swift b/Source/Modules/WindowControllers/CtlClientListMgr.swift
index e07df6a5..629cb889 100644
--- a/Source/Modules/WindowControllers/CtlClientListMgr.swift
+++ b/Source/Modules/WindowControllers/CtlClientListMgr.swift
@@ -103,31 +103,38 @@ extension CtlClientListMgr {
             "Choose the target application bundle.", comment: ""
           )
           dlgOpenPath.showsResizeIndicator = true
+          dlgOpenPath.allowsMultipleSelection = true
+          dlgOpenPath.allowedFileTypes = ["app"]
+          dlgOpenPath.allowsOtherFileTypes = false
           dlgOpenPath.showsHiddenFiles = true
           dlgOpenPath.canChooseFiles = true
           dlgOpenPath.canChooseDirectories = false
           dlgOpenPath.beginSheetModal(for: window) { result in
             switch result {
               case .OK:
-                guard let url = dlgOpenPath.url else { return }
-                var title = NSLocalizedString("The selected item is not a valid macOS application bundle.", comment: "")
-                let text = NSLocalizedString("Please try again.", comment: "")
-                guard let bundle = Bundle(url: url) else {
-                  self.callAlert(window, title: title, text: text)
-                  return
-                }
-                guard let identifier = bundle.bundleIdentifier else {
-                  self.callAlert(window, title: title, text: text)
-                  return
-                }
-                if PrefMgr.shared.clientsIMKTextInputIncapable.contains(identifier) {
-                  title = NSLocalizedString(
-                    "The selected item's identifier is already in the list.", comment: ""
+                for url in dlgOpenPath.urls {
+                  var title = NSLocalizedString(
+                    "The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier.",
+                    comment: ""
                   )
-                  self.callAlert(window, title: title)
-                  return
+                  let text = url.path + "\n\n" + NSLocalizedString("Please try again.", comment: "")
+                  guard let bundle = Bundle(url: url) else {
+                    self.callAlert(window, title: title, text: text)
+                    return
+                  }
+                  guard let identifier = bundle.bundleIdentifier else {
+                    self.callAlert(window, title: title, text: text)
+                    return
+                  }
+                  if PrefMgr.shared.clientsIMKTextInputIncapable.contains(identifier) {
+                    title = NSLocalizedString(
+                      "The selected item's identifier is already in the list.", comment: ""
+                    )
+                    self.callAlert(window, title: title, text: identifier + "\n\n" + url.path)
+                    return
+                  }
+                  self.applyNewValue(identifier)
                 }
-                self.applyNewValue(identifier)
               default: return
             }
           }
diff --git a/Source/Resources/Base.lproj/Localizable.strings b/Source/Resources/Base.lproj/Localizable.strings
index 2173e5a7..5d3e63ee 100644
--- a/Source/Resources/Base.lproj/Localizable.strings
+++ b/Source/Resources/Base.lproj/Localizable.strings
@@ -10,7 +10,7 @@
 "Add Client" = "Add Client";
 "Remove Selected" = "Remove Selected";
 "Choose the target application bundle." = "Choose the target application bundle.";
-"The selected item is not a valid macOS application bundle." = "The selected item is not a valid macOS application bundle.";
+"The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier." = "The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier.";
 "Please try again." = "Please try again.";
 "The selected item's identifier is already in the list." = "The selected item's identifier is already in the list.";
 "Update Check Completed" = "Update Check Completed";
diff --git a/Source/Resources/en.lproj/Localizable.strings b/Source/Resources/en.lproj/Localizable.strings
index 2173e5a7..5d3e63ee 100644
--- a/Source/Resources/en.lproj/Localizable.strings
+++ b/Source/Resources/en.lproj/Localizable.strings
@@ -10,7 +10,7 @@
 "Add Client" = "Add Client";
 "Remove Selected" = "Remove Selected";
 "Choose the target application bundle." = "Choose the target application bundle.";
-"The selected item is not a valid macOS application bundle." = "The selected item is not a valid macOS application bundle.";
+"The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier." = "The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier.";
 "Please try again." = "Please try again.";
 "The selected item's identifier is already in the list." = "The selected item's identifier is already in the list.";
 "Update Check Completed" = "Update Check Completed";
diff --git a/Source/Resources/ja.lproj/Localizable.strings b/Source/Resources/ja.lproj/Localizable.strings
index accf7c21..5db50ad0 100644
--- a/Source/Resources/ja.lproj/Localizable.strings
+++ b/Source/Resources/ja.lproj/Localizable.strings
@@ -10,7 +10,7 @@
 "Add Client" = "入れる";
 "Remove Selected" = "外す";
 "Choose the target application bundle." = "登録したいアプリのバンドルのお選びを。";
-"The selected item is not a valid macOS application bundle." = "今選んだんのは正しい macOS アプリバンドルではないと考えられる。";
+"The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier." = "今選んだんのは正しい macOS アプリバンドルではないと考えられる。少なくとも、唯一識別子は検出できぬ。";
 "Please try again." = "お選び直しください。";
 "The selected item's identifier is already in the list." = "今選んだバンドルの唯一識別子（Bundle Identifier）は既に登録済みである。";
 "Update Check Completed" = "新バージョンチェック完了";
diff --git a/Source/Resources/zh-Hans.lproj/Localizable.strings b/Source/Resources/zh-Hans.lproj/Localizable.strings
index 67941353..3a43c7da 100644
--- a/Source/Resources/zh-Hans.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hans.lproj/Localizable.strings
@@ -10,7 +10,7 @@
 "Add Client" = "登记新客体";
 "Remove Selected" = "移除所选条目";
 "Choose the target application bundle." = "请选择要登记的应用程式的封包。";
-"The selected item is not a valid macOS application bundle." = "当前所选之物并非 macOS 应用程式封包。";
+"The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier." = "当前所选之物并非 macOS 应用程式封包，至少无法发现其唯一标帜（Bundle Identifier）。";
 "Please try again." = "请重试。";
 "The selected item's identifier is already in the list." = "当前所选之封包的唯一标帜（Bundle Identifier）已被登记。";
 "Update Check Completed" = "更新检查完毕";
diff --git a/Source/Resources/zh-Hant.lproj/Localizable.strings b/Source/Resources/zh-Hant.lproj/Localizable.strings
index e6c28b9c..e8c39bfd 100644
--- a/Source/Resources/zh-Hant.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hant.lproj/Localizable.strings
@@ -10,7 +10,7 @@
 "Add Client" = "登記新客體";
 "Remove Selected" = "移除所選條目";
 "Choose the target application bundle." = "請選擇要登記的應用程式的封包。";
-"The selected item is not a valid macOS application bundle." = "當前所選之物並非 macOS 應用程式封包。";
+"The selected item is not a valid macOS application bundle, nor not having a valid app bundle identifier." = "當前所選之物並非 macOS 應用程式封包，至少無法發現其唯一標幟（Bundle Identifier）。";
 "Please try again." = "請重試。";
 "The selected item's identifier is already in the list." = "當前所選之封包的唯一標幟（Bundle Identifier）已被登記。";
 "Update Check Completed" = "更新檢查完畢";