diff --git a/frontend/src/modules/dashboard/BotDashboardModule.css b/frontend/src/modules/dashboard/BotDashboardModule.css
index 5d165e1..24f4821 100644
--- a/frontend/src/modules/dashboard/BotDashboardModule.css
+++ b/frontend/src/modules/dashboard/BotDashboardModule.css
@@ -1395,6 +1395,20 @@
   width: min(1080px, 95vw);
 }
 
+.modal-preview-fullscreen {
+  width: 100vw;
+  max-width: 100vw;
+  height: 100vh;
+  max-height: 100vh;
+  margin: 0;
+  border-radius: 0;
+}
+
+.modal-preview-fullscreen .workspace-preview-body {
+  min-height: calc(100vh - 170px);
+  max-height: calc(100vh - 170px);
+}
+
 .workspace-preview-body {
   border: 1px solid var(--line);
   border-radius: 10px;
diff --git a/frontend/src/modules/dashboard/BotDashboardModule.tsx b/frontend/src/modules/dashboard/BotDashboardModule.tsx
index 1a938df..09d0f94 100644
--- a/frontend/src/modules/dashboard/BotDashboardModule.tsx
+++ b/frontend/src/modules/dashboard/BotDashboardModule.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useMemo, useRef, useState, type AnchorHTMLAttributes, type ChangeEvent, type KeyboardEvent, type ReactNode } from 'react';
 import axios from 'axios';
-import { Activity, Boxes, Check, Clock3, EllipsisVertical, Eye, EyeOff, FileText, FolderOpen, Hammer, MessageSquareText, Paperclip, Plus, Power, PowerOff, RefreshCw, Repeat2, Save, Settings2, SlidersHorizontal, TriangleAlert, Trash2, UserRound, Waypoints, X } from 'lucide-react';
+import { Activity, Boxes, Check, Clock3, EllipsisVertical, Eye, EyeOff, FileText, FolderOpen, Hammer, Maximize2, MessageSquareText, Minimize2, Paperclip, Plus, Power, PowerOff, RefreshCw, Repeat2, Save, Settings2, SlidersHorizontal, TriangleAlert, Trash2, UserRound, Waypoints, X } from 'lucide-react';
 import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
 import rehypeRaw from 'rehype-raw';
@@ -208,7 +208,7 @@ function normalizeRuntimeState(s?: string) {
 function isPreviewableWorkspaceFile(node: WorkspaceNode) {
   if (node.type !== 'file') return false;
   const ext = (node.ext || '').toLowerCase();
-  return ['.md', '.json', '.log', '.txt', '.csv', '.pdf', '.png', '.jpg', '.jpeg', '.webp'].includes(ext);
+  return ['.md', '.json', '.log', '.txt', '.csv', '.pdf', '.png', '.jpg', '.jpeg', '.webp', '.doc', '.docx', '.xls', '.xlsx', '.xlsm', '.ppt', '.pptx', '.odt', '.ods', '.odp', '.wps'].includes(ext);
 }
 
 function isPdfPath(path: string) {
@@ -220,9 +220,16 @@ function isImagePath(path: string) {
   return normalized.endsWith('.png') || normalized.endsWith('.jpg') || normalized.endsWith('.jpeg') || normalized.endsWith('.webp');
 }
 
+function isOfficePath(path: string) {
+  const normalized = String(path || '').trim().toLowerCase();
+  return ['.doc', '.docx', '.xls', '.xlsx', '.xlsm', '.ppt', '.pptx', '.odt', '.ods', '.odp', '.wps'].some((ext) =>
+    normalized.endsWith(ext),
+  );
+}
+
 function isPreviewableWorkspacePath(path: string) {
   const normalized = String(path || '').trim().toLowerCase();
-  return ['.md', '.json', '.log', '.txt', '.csv', '.pdf', '.png', '.jpg', '.jpeg', '.webp'].some((ext) =>
+  return ['.md', '.json', '.log', '.txt', '.csv', '.pdf', '.png', '.jpg', '.jpeg', '.webp', '.doc', '.docx', '.xls', '.xlsx', '.xlsm', '.ppt', '.pptx', '.odt', '.ods', '.odp', '.wps'].some((ext) =>
     normalized.endsWith(ext),
   );
 }
@@ -252,7 +259,7 @@ function decorateWorkspacePathsForMarkdown(text: string) {
     '[$1]($2)',
   );
   const workspacePathPattern =
-    /\/root\/\.nanobot\/workspace\/[^\n\r<>"'`]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp)\b/gi;
+    /\/root\/\.nanobot\/workspace\/[^\n\r<>"'`]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp|doc|docx|xls|xlsx|xlsm|ppt|pptx|odt|ods|odp|wps)\b/gi;
   return normalizedExistingLinks.replace(workspacePathPattern, (fullPath) => {
     const normalized = normalizeDashboardAttachmentPath(fullPath);
     if (!normalized) return fullPath;
@@ -366,6 +373,7 @@ export function BotDashboardModule({
   const [workspaceParentPath, setWorkspaceParentPath] = useState<string | null>(null);
   const [workspaceFileLoading, setWorkspaceFileLoading] = useState(false);
   const [workspacePreview, setWorkspacePreview] = useState<WorkspacePreviewState | null>(null);
+  const [workspacePreviewFullscreen, setWorkspacePreviewFullscreen] = useState(false);
   const [workspaceAutoRefresh, setWorkspaceAutoRefresh] = useState(true);
   const [pendingAttachments, setPendingAttachments] = useState<string[]>([]);
   const [isUploadingAttachments, setIsUploadingAttachments] = useState(false);
@@ -396,9 +404,32 @@ export function BotDashboardModule({
   const [expandedProgressByKey, setExpandedProgressByKey] = useState<Record<string, boolean>>({});
   const [showRuntimeActionModal, setShowRuntimeActionModal] = useState(false);
   const runtimeMenuRef = useRef<HTMLDivElement | null>(null);
+  const buildWorkspaceDownloadHref = (filePath: string, forceDownload: boolean = true) =>
+    `${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/download?path=${encodeURIComponent(filePath)}${forceDownload ? '&download=1' : ''}`;
+  const closeWorkspacePreview = () => {
+    setWorkspacePreview(null);
+    setWorkspacePreviewFullscreen(false);
+  };
+  const triggerWorkspaceFileDownload = (filePath: string) => {
+    if (!selectedBotId) return;
+    const normalized = String(filePath || '').trim();
+    if (!normalized) return;
+    const filename = normalized.split('/').pop() || 'workspace-file';
+    const link = document.createElement('a');
+    link.href = buildWorkspaceDownloadHref(normalized, true);
+    link.download = filename;
+    link.rel = 'noopener noreferrer';
+    document.body.appendChild(link);
+    link.click();
+    link.remove();
+  };
   const openWorkspacePathFromChat = (path: string) => {
     const normalized = String(path || '').trim();
     if (!normalized) return;
+    if (isPdfPath(normalized) || isOfficePath(normalized)) {
+      triggerWorkspaceFileDownload(normalized);
+      return;
+    }
     if (!isPreviewableWorkspacePath(normalized)) {
       notify(fileNotPreviewableLabel, { tone: 'warning' });
       return;
@@ -409,7 +440,7 @@ export function BotDashboardModule({
     const source = String(text || '');
     if (!source) return [source];
     const pattern =
-      /\[(\/root\/\.nanobot\/workspace\/[^\]]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp))\]\((https:\/\/workspace\.local\/open\/[^)\s]+)\)|\/root\/\.nanobot\/workspace\/[^\n\r<>"'`]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp)\b|https:\/\/workspace\.local\/open\/[^\s)]+/gi;
+      /\[(\/root\/\.nanobot\/workspace\/[^\]]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp|doc|docx|xls|xlsx|xlsm|ppt|pptx|odt|ods|odp|wps))\]\((https:\/\/workspace\.local\/open\/[^)\s]+)\)|\/root\/\.nanobot\/workspace\/[^\n\r<>"'`]+?\.(?:md|json|log|txt|csv|pdf|png|jpg|jpeg|webp|doc|docx|xls|xlsx|xlsm|ppt|pptx|odt|ods|odp|wps)\b|https:\/\/workspace\.local\/open\/[^\s)]+/gi;
     const nodes: ReactNode[] = [];
     let lastIndex = 0;
     let matchIndex = 0;
@@ -485,11 +516,7 @@ export function BotDashboardModule({
               href="#"
               onClick={(event) => {
                 event.preventDefault();
-                if (!isPreviewableWorkspacePath(workspacePath)) {
-                  notify(fileNotPreviewableLabel, { tone: 'warning' });
-                  return;
-                }
-                void openWorkspaceFilePreview(workspacePath);
+                openWorkspacePathFromChat(workspacePath);
               }}
               {...props}
             >
@@ -696,17 +723,20 @@ export function BotDashboardModule({
                   <div className="ops-chat-attachments">
                     {(item.attachments || []).map((rawPath) => {
                       const filePath = normalizeDashboardAttachmentPath(rawPath);
-                      const isPdf = isPdfPath(filePath);
-                      const href = `${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/download?path=${encodeURIComponent(filePath)}${isPdf ? '&download=1' : ''}`;
                       const filename = filePath.split('/').pop() || filePath;
                       return (
                         <a
                           key={`${item.ts}-${filePath}`}
                           className="ops-attach-link mono"
-                          href={href}
-                          target="_blank"
-                          rel="noreferrer"
-                          download={isPdf ? filename : undefined}
+                          href="#"
+                          onClick={(event) => {
+                            event.preventDefault();
+                            if (isPdfPath(filePath) || isOfficePath(filePath)) {
+                              triggerWorkspaceFileDownload(filePath);
+                              return;
+                            }
+                            openWorkspacePathFromChat(filePath);
+                          }}
                         >
                           {filename}
                         </a>
@@ -822,9 +852,9 @@ export function BotDashboardModule({
   const openWorkspaceFilePreview = async (path: string) => {
     if (!selectedBotId || !path) return;
     const normalizedPath = String(path || '').trim();
-    if (isPdfPath(normalizedPath)) {
-      const href = `${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/download?path=${encodeURIComponent(normalizedPath)}&download=1`;
-      window.open(href, '_blank', 'noopener,noreferrer');
+    setWorkspacePreviewFullscreen(false);
+    if (isPdfPath(normalizedPath) || isOfficePath(normalizedPath)) {
+      triggerWorkspaceFileDownload(normalizedPath);
       return;
     }
     if (isImagePath(normalizedPath)) {
@@ -1565,14 +1595,14 @@ export function BotDashboardModule({
       }
 
       const previewable = isPreviewableWorkspaceFile(node);
-      const pdfFile = String(node.ext || '').toLowerCase() === '.pdf';
+      const downloadOnlyFile = isPdfPath(node.path) || isOfficePath(node.path);
       rendered.push(
         <button
           key={key}
           className={`workspace-entry file ${previewable ? '' : 'disabled'}`}
           disabled={!previewable || workspaceFileLoading}
           onClick={() => void openWorkspaceFilePreview(node.path)}
-          title={previewable ? (pdfFile ? t.download : t.previewTitle) : t.fileNotPreviewable}
+          title={previewable ? (downloadOnlyFile ? t.download : t.previewTitle) : t.fileNotPreviewable}
         >
           <FileText size={14} />
           <span className="workspace-entry-name">{node.name}</span>
@@ -2499,8 +2529,8 @@ export function BotDashboardModule({
       )}
 
       {workspacePreview && (
-        <div className="modal-mask" onClick={() => setWorkspacePreview(null)}>
-          <div className="modal-card modal-preview" onClick={(e) => e.stopPropagation()}>
+        <div className="modal-mask" onClick={closeWorkspacePreview}>
+          <div className={`modal-card modal-preview ${workspacePreviewFullscreen ? 'modal-preview-fullscreen' : ''}`} onClick={(e) => e.stopPropagation()}>
             <div className="modal-title-row">
               <h3>{t.filePreview}</h3>
               <span className="modal-sub mono">{workspacePreview.path}</span>
@@ -2532,6 +2562,14 @@ export function BotDashboardModule({
             <div className="row-between">
               <span className="workspace-preview-meta mono">{workspacePreview.ext || '-'}</span>
               <div style={{ display: 'inline-flex', alignItems: 'center', gap: 8 }}>
+                <button
+                  className="btn btn-secondary"
+                  onClick={() => setWorkspacePreviewFullscreen((v) => !v)}
+                  title={workspacePreviewFullscreen ? (isZh ? '退出全屏' : 'Exit full screen') : (isZh ? '全屏预览' : 'Full screen')}
+                  aria-label={workspacePreviewFullscreen ? (isZh ? '退出全屏' : 'Exit full screen') : (isZh ? '全屏预览' : 'Full screen')}
+                >
+                  {workspacePreviewFullscreen ? <Minimize2 size={14} /> : <Maximize2 size={14} />}
+                </button>
                 <a
                   className="btn btn-secondary"
                   href={`${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/download?path=${encodeURIComponent(workspacePreview.path)}&download=1`}
@@ -2541,7 +2579,7 @@ export function BotDashboardModule({
                 >
                   {t.download}
                 </a>
-                <button className="btn btn-primary" onClick={() => setWorkspacePreview(null)}>{t.close}</button>
+                <button className="btn btn-primary" onClick={closeWorkspacePreview}>{t.close}</button>
               </div>
             </div>
           </div>