1. GUID key (...Uninstall\{GUID}) is MSI-native metadata generated by Windows Installer.

2. Non-GUID key (...Uninstall\RustDesk) is explicitly written by RustDesk’s MSI compatibility component in res/msi/Package/Components/Regs.wxs:44, populated by preprocess.py --arp from .github/workflows/
     flutter-build.yml:262.

  So they were not using the same EstimatedSize logic:

  - MSI GUID key: MSI-calculated size (KB).
  - RustDesk key: custom script value from res/msi/preprocess.py:339 (previously bytes, now fixed to KB).

  That mismatch is exactly why you saw different sizes.

flutter/lib/common/hbbs/hbbs.dart

@@ -25,6 +25,7 @@ enum UserStatus { kDisabled, kNormal, kUnverified }
 // Is all the fields of the user needed?
 class UserPayload {
   String name = '';
+  String displayName = '';
   String email = '';
   String note = '';
   String? verifier;
@@ -33,6 +34,7 @@ class UserPayload {
 
   UserPayload.fromJson(Map<String, dynamic> json)
       : name = json['name'] ?? '',
+        displayName = json['display_name'] ?? '',
         email = json['email'] ?? '',
         note = json['note'] ?? '',
         verifier = json['verifier'],
@@ -46,6 +48,7 @@ class UserPayload {
   Map<String, dynamic> toJson() {
     final Map<String, dynamic> map = {
       'name': name,
+      'display_name': displayName,
       'status': status == UserStatus.kDisabled
           ? 0
           : status == UserStatus.kUnverified
@@ -58,9 +61,14 @@ class UserPayload {
   Map<String, dynamic> toGroupCacheJson() {
     final Map<String, dynamic> map = {
       'name': name,
+      'display_name': displayName,
     };
     return map;
   }
+
+  String get displayNameOrName {
+    return displayName.trim().isEmpty ? name : displayName;
+  }
 }
 
 class PeerPayload {

flutter/lib/common/widgets/my_group.dart

@@ -158,9 +158,9 @@ class _MyGroupState extends State<MyGroup> {
     return Obx(() {
       final userItems = gFFI.groupModel.users.where((p0) {
         if (searchAccessibleItemNameText.isNotEmpty) {
-          return p0.name
-              .toLowerCase()
-              .contains(searchAccessibleItemNameText.value.toLowerCase());
+          final search = searchAccessibleItemNameText.value.toLowerCase();
+          return p0.name.toLowerCase().contains(search) ||
+              p0.displayNameOrName.toLowerCase().contains(search);
         }
         return true;
       }).toList();
@@ -187,6 +187,7 @@ class _MyGroupState extends State<MyGroup> {
 
   Widget _buildUserItem(UserPayload user) {
     final username = user.name;
+    final displayName = user.displayNameOrName;
     return InkWell(onTap: () {
       isSelectedDeviceGroup.value = false;
       if (selectedAccessibleItemName.value != username) {
@@ -229,7 +230,7 @@ class _MyGroupState extends State<MyGroup> {
                     ),
                   ),
                 ).marginOnly(right: 4),
-                if (isMe) Flexible(child: Text(username)),
+                if (isMe) Flexible(child: Text(displayName)),
                 if (isMe)
                   Flexible(
                     child: Container(
@@ -246,7 +247,7 @@ class _MyGroupState extends State<MyGroup> {
                       ),
                     ),
                   ),
-                if (!isMe) Expanded(child: Text(username)),
+                if (!isMe) Expanded(child: Text(displayName)),
               ],
             ).paddingSymmetric(vertical: 4),
           ),

flutter/lib/desktop/pages/desktop_setting_page.dart

@@ -2016,7 +2016,9 @@ class _AccountState extends State<_Account> {
 
   Widget accountAction() {
     return Obx(() => _Button(
-        gFFI.userModel.userName.value.isEmpty ? 'Login' : 'Logout',
+        gFFI.userModel.userName.value.isEmpty
+            ? 'Login'
+            : 'Logout (${gFFI.userModel.accountLabelWithHandle})',
         () => {
               gFFI.userModel.userName.value.isEmpty
                   ? loginDialog()
@@ -2037,6 +2039,9 @@ class _AccountState extends State<_Account> {
           offstage: gFFI.userModel.userName.value.isEmpty,
           child: Column(
             children: [
+              if (gFFI.userModel.displayName.value.trim().isNotEmpty &&
+                  gFFI.userModel.displayName.value != gFFI.userModel.userName.value)
+                text('Display Name', gFFI.userModel.displayName.value),
               text('Username', gFFI.userModel.userName.value),
               // text('Group', gFFI.groupModel.groupName.value),
             ],
@@ -2130,7 +2135,9 @@ class _PluginState extends State<_Plugin> {
 
   Widget accountAction() {
     return Obx(() => _Button(
-        gFFI.userModel.userName.value.isEmpty ? 'Login' : 'Logout',
+        gFFI.userModel.userName.value.isEmpty
+            ? 'Login'
+            : 'Logout (${gFFI.userModel.accountLabelWithHandle})',
         () => {
               gFFI.userModel.userName.value.isEmpty
                   ? loginDialog()

flutter/lib/mobile/pages/settings_page.dart

@@ -688,7 +688,7 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
               SettingsTile(
                 title: Obx(() => Text(gFFI.userModel.userName.value.isEmpty
                     ? translate('Login')
-                    : '${translate('Logout')} (${gFFI.userModel.userName.value})')),
+                    : '${translate('Logout')} (${gFFI.userModel.accountLabelWithHandle})')),
                 leading: Icon(Icons.person),
                 onPressed: (context) {
                   if (gFFI.userModel.userName.value.isEmpty) {

flutter/lib/models/user_model.dart

@@ -16,9 +16,23 @@ bool refreshingUser = false;
 
 class UserModel {
   final RxString userName = ''.obs;
+  final RxString displayName = ''.obs;
   final RxBool isAdmin = false.obs;
   final RxString networkError = ''.obs;
   bool get isLogin => userName.isNotEmpty;
+  String get displayNameOrUserName =>
+      displayName.value.trim().isEmpty ? userName.value : displayName.value;
+  String get accountLabelWithHandle {
+    final username = userName.value.trim();
+    if (username.isEmpty) {
+      return '';
+    }
+    final preferred = displayName.value.trim();
+    if (preferred.isEmpty || preferred == username) {
+      return username;
+    }
+    return '$preferred (@$username)';
+  }
   WeakReference<FFI> parent;
 
   UserModel(this.parent) {
@@ -98,7 +112,8 @@ class UserModel {
   _updateLocalUserInfo() {
     final userInfo = getLocalUserInfo();
     if (userInfo != null) {
-      userName.value = userInfo['name'];
+      userName.value = (userInfo['name'] ?? '').toString();
+      displayName.value = (userInfo['display_name'] ?? '').toString();
     }
   }
 
@@ -110,10 +125,12 @@ class UserModel {
       await gFFI.groupModel.reset();
     }
     userName.value = '';
+    displayName.value = '';
   }
 
   _parseAndUpdateUser(UserPayload user) {
     userName.value = user.name;
+    displayName.value = user.displayName;
     isAdmin.value = user.isAdmin;
     bind.mainSetLocalOption(key: 'user_info', value: jsonEncode(user));
     if (isWeb) {

res/msi/preprocess.py

@@ -336,7 +336,9 @@ def gen_custom_ARPSYSTEMCOMPONENT_True(args, dist_dir):
             f'{indent}<RegistryValue Type="integer" Name="Language" Value="[ProductLanguage]" />\n'
         )
 
-        estimated_size = get_folder_size(dist_dir)
+        # EstimatedSize in uninstall registry must be in KB.
+        estimated_size_bytes = get_folder_size(dist_dir)
+        estimated_size = max(1, (estimated_size_bytes + 1023) // 1024)
         lines_new.append(
             f'{indent}<RegistryValue Type="integer" Name="EstimatedSize" Value="{estimated_size}" />\n'
         )

src/client.rs

@@ -2630,10 +2630,12 @@ impl LoginConfigHandler {
             display_name =
                 serde_json::from_str::<serde_json::Value>(&LocalConfig::get_option("user_info"))
                     .map(|x| {
-                        x.get("name")
-                            .map(|x| x.as_str().unwrap_or_default())
+                        x.get("display_name")
+                            .and_then(|x| x.as_str())
+                            .filter(|x| !x.is_empty())
+                            .or_else(|| x.get("name").and_then(|x| x.as_str()))
+                            .map(|x| x.to_owned())
                             .unwrap_or_default()
-                            .to_owned()
                     })
                     .unwrap_or_default();
         }

src/hbbs_http/account.rs

@@ -80,6 +80,8 @@ pub enum UserStatus {
 pub struct UserPayload {
     pub name: String,
     #[serde(default)]
+    pub display_name: Option<String>,
+    #[serde(default)]
     pub email: Option<String>,
     #[serde(default)]
     pub note: Option<String>,
@@ -268,7 +270,12 @@ impl OidcSession {
                             );
                             LocalConfig::set_option(
                                 "user_info".to_owned(),
-                                serde_json::json!({ "name": auth_body.user.name, "status": auth_body.user.status }).to_string(),
+                                serde_json::json!({
+                                    "name": auth_body.user.name,
+                                    "display_name": auth_body.user.display_name,
+                                    "status": auth_body.user.status
+                                })
+                                .to_string(),
                             );
                         }
                     }

src/ui/index.tis

@@ -358,6 +358,22 @@ function getUserName() {
     return '';
 }
 
+function getAccountLabelWithHandle() {
+    try {
+        var user = JSON.parse(handler.get_local_option("user_info"));
+        var username = (user.name || '').trim();
+        if (!username) {
+            return '';
+        }
+        var displayName = (user.display_name || '').trim();
+        if (!displayName || displayName == username) {
+            return username;
+        }
+        return displayName + " (@" + username + ")";
+    } catch(e) {}
+    return '';
+}
+
 // Shared dialog functions
 function open_custom_server_dialog() {
     var configOptions = handler.get_options();
@@ -493,7 +509,7 @@ class MyIdMenu: Reactor.Component {
     }
 
     function renderPop() {
-        var username = handler.get_local_option("access_token") ? getUserName() : '';
+        var accountLabel = handler.get_local_option("access_token") ? getAccountLabelWithHandle() : '';
         return <popup>
             <menu.context #config-options>
                 {!disable_settings && <li #enable-keyboard><span>{svg_checkmark}</span>{translate('Enable keyboard/mouse')}</li>}
@@ -521,8 +537,8 @@ class MyIdMenu: Reactor.Component {
                 {!disable_settings && <DirectServer />}
                 {!disable_settings && false && handler.using_public_server() && <li #allow-always-relay><span>{svg_checkmark}</span>{translate('Always connect via relay')}</li>}
                 {!disable_change_id && handler.is_ok_change_id() ? <div .separator /> : ""}
-                {!disable_account && (username ?
-                <li #logout>{translate('Logout')} ({username})</li> :
+                {!disable_account && (accountLabel ?
+                <li #logout>{translate('Logout')} ({accountLabel})</li> :
                 <li #login>{translate('Login')}</li>)}
                 {!disable_change_id && !disable_settings && handler.is_ok_change_id() && key_confirmed && connect_status > 0 ? <li #change-id>{translate('Change ID')}</li> : ""}
                 <div .separator />
@@ -1430,6 +1446,9 @@ checkConnectStatus();
 
 function set_local_user_info(user) {
     var user_info = {name: user.name};
+    if (user.display_name) {
+        user_info.display_name = user.display_name;
+    }
     if (user.status) {
         user_info.status = user.status;
     }