diff --git a/src/components/chat/messages/MessageFile.tsx b/src/components/chat/messages/MessageFile.tsx
index c6ab612a..e6327752 100644
--- a/src/components/chat/messages/MessageFile.tsx
+++ b/src/components/chat/messages/MessageFile.tsx
@@ -13,16 +13,35 @@ interface MessageFileProps {
 const MessageFile: React.FC<MessageFileProps> = ({ attachments }) => {
   const { t } = useLanguage('chat');
 
-  const downloadFile = (attachment: Attachment) => {
-    const result = openAttachmentInNewTab({
-      url: attachment.data_url,
-      filename: attachment.fallback_title || t('messages.messageFile.fileFallback'),
-    });
+  const downloadFile = async (attachment: Attachment) => {
+    const url = attachment.data_url?.trim();
+    if (!url) return;
 
-    if (result === 'download-fallback') {
-      toast.info(t('messages.messageImage.downloadStarted'), {
-        description: attachment.fallback_title || t('messages.messageFile.fileFallbackTitle'),
+    const filename = attachment.fallback_title || t('messages.messageFile.fileFallback');
+
+    try {
+      const response = await fetch(url, { mode: 'cors' });
+      if (!response.ok) {
+        console.warn('[MessageFile] non-ok response:', response.status, url);
+        toast.warning(t('messages.messageFile.downloadFallbackOpenedInNewTab'), {
+          description: t('messages.messageFile.downloadFallbackReason.serverError', { status: response.status }),
+        });
+        openAttachmentInNewTab({ url, filename });
+        return;
+      }
+      const blob = await response.blob();
+      const blobUrl = URL.createObjectURL(blob);
+      const link = document.createElement('a');
+      link.href = blobUrl;
+      link.download = filename;
+      link.click();
+      setTimeout(() => URL.revokeObjectURL(blobUrl), 0);
+    } catch (err) {
+      console.warn('[MessageFile] download fallback after fetch error:', err);
+      toast.warning(t('messages.messageFile.downloadFallbackOpenedInNewTab'), {
+        description: t('messages.messageFile.downloadFallbackReason.network'),
       });
+      openAttachmentInNewTab({ url, filename });
     }
   };
 
diff --git a/src/i18n/locales/en/chat.json b/src/i18n/locales/en/chat.json
index e71510a4..3c7b3f28 100644
--- a/src/i18n/locales/en/chat.json
+++ b/src/i18n/locales/en/chat.json
@@ -61,7 +61,12 @@
     "messageFile": {
       "fileFallback": "file",
       "unknownSize": "Unknown size",
-      "fileFallbackTitle": "File"
+      "fileFallbackTitle": "File",
+      "downloadFallbackOpenedInNewTab": "File opened in new tab",
+      "downloadFallbackReason": {
+        "serverError": "Server returned {{status}} — could not download directly.",
+        "network": "Network error or CORS block — could not download directly."
+      }
     },
     "messageImage": {
       "downloadStarted": "Download started",
diff --git a/src/i18n/locales/es/chat.json b/src/i18n/locales/es/chat.json
index 665b0f4b..f15a1e76 100644
--- a/src/i18n/locales/es/chat.json
+++ b/src/i18n/locales/es/chat.json
@@ -60,7 +60,12 @@
     "messageFile": {
       "fileFallback": "archivo",
       "unknownSize": "Tamaño desconocido",
-      "fileFallbackTitle": "Archivo"
+      "fileFallbackTitle": "Archivo",
+      "downloadFallbackOpenedInNewTab": "Archivo abierto en nueva pestaña",
+      "downloadFallbackReason": {
+        "serverError": "El servidor devolvió {{status}} — no se pudo descargar directamente.",
+        "network": "Error de red o bloqueo de CORS — no se pudo descargar directamente."
+      }
     },
     "messageImage": {
       "downloadStarted": "Descarga iniciada",
diff --git a/src/i18n/locales/fr/chat.json b/src/i18n/locales/fr/chat.json
index 4a282fb6..0718634f 100644
--- a/src/i18n/locales/fr/chat.json
+++ b/src/i18n/locales/fr/chat.json
@@ -60,7 +60,12 @@
     "messageFile": {
       "fileFallback": "fichier",
       "unknownSize": "Taille inconnue",
-      "fileFallbackTitle": "Fichier"
+      "fileFallbackTitle": "Fichier",
+      "downloadFallbackOpenedInNewTab": "Fichier ouvert dans un nouvel onglet",
+      "downloadFallbackReason": {
+        "serverError": "Le serveur a renvoyé {{status}} — impossible de télécharger directement.",
+        "network": "Erreur réseau ou blocage CORS — impossible de télécharger directement."
+      }
     },
     "messageImage": {
       "downloadStarted": "Téléchargement démarré",
diff --git a/src/i18n/locales/it/chat.json b/src/i18n/locales/it/chat.json
index 061be92b..33094163 100644
--- a/src/i18n/locales/it/chat.json
+++ b/src/i18n/locales/it/chat.json
@@ -60,7 +60,12 @@
     "messageFile": {
       "fileFallback": "file",
       "unknownSize": "Dimensione sconosciuta",
-      "fileFallbackTitle": "File"
+      "fileFallbackTitle": "File",
+      "downloadFallbackOpenedInNewTab": "File aperto in una nuova scheda",
+      "downloadFallbackReason": {
+        "serverError": "Il server ha restituito {{status}} — impossibile scaricare direttamente.",
+        "network": "Errore di rete o blocco CORS — impossibile scaricare direttamente."
+      }
     },
     "messageImage": {
       "downloadStarted": "Download avviato",
diff --git a/src/i18n/locales/pt-BR/chat.json b/src/i18n/locales/pt-BR/chat.json
index 9f7d2dce..860393fa 100644
--- a/src/i18n/locales/pt-BR/chat.json
+++ b/src/i18n/locales/pt-BR/chat.json
@@ -61,7 +61,12 @@
     "messageFile": {
       "fileFallback": "arquivo",
       "unknownSize": "Tamanho desconhecido",
-      "fileFallbackTitle": "Arquivo"
+      "fileFallbackTitle": "Arquivo",
+      "downloadFallbackOpenedInNewTab": "Arquivo aberto em nova aba",
+      "downloadFallbackReason": {
+        "serverError": "Servidor retornou {{status}} — não foi possível baixar diretamente.",
+        "network": "Falha de rede ou bloqueio de CORS — não foi possível baixar diretamente."
+      }
     },
     "messageImage": {
       "downloadStarted": "Download iniciado",
diff --git a/src/i18n/locales/pt/chat.json b/src/i18n/locales/pt/chat.json
index ebd9b141..b5a570a9 100644
--- a/src/i18n/locales/pt/chat.json
+++ b/src/i18n/locales/pt/chat.json
@@ -60,7 +60,12 @@
     "messageFile": {
       "fileFallback": "arquivo",
       "unknownSize": "Tamanho desconhecido",
-      "fileFallbackTitle": "Arquivo"
+      "fileFallbackTitle": "Arquivo",
+      "downloadFallbackOpenedInNewTab": "Ficheiro aberto em nova aba",
+      "downloadFallbackReason": {
+        "serverError": "O servidor retornou {{status}} — não foi possível descarregar diretamente.",
+        "network": "Falha de rede ou bloqueio de CORS — não foi possível descarregar diretamente."
+      }
     },
     "messageImage": {
       "downloadStarted": "Download iniciado",