diff --git a/routes/admin_observability_routes.py b/routes/admin_observability_routes.py
index 92dadaa..027ee4c 100644
--- a/routes/admin_observability_routes.py
+++ b/routes/admin_observability_routes.py
@@ -19,7 +19,7 @@ Operation Ollama-First v5.0 / Phase 27 — Admin Observability Dashboard
 
 import logging
 from datetime import datetime, timedelta
-from flask import Blueprint, render_template, request, jsonify
+from flask import Blueprint, render_template, request, jsonify, send_file
 from sqlalchemy import text as sa_text
 
 from auth import login_required, get_current_user
@@ -1836,6 +1836,40 @@ def ppt_audit_trigger_aider_heal():
         return jsonify({'ok': False, 'error': f'{type(e).__name__}: {str(e)[:200]}'}), 500
 
 
+@admin_observability_bp.route('/ppt_audit_file/<path:filename>')
+@login_required
+def ppt_audit_file(filename: str):
+    """提供觀測台簡報檔案預覽/下載。
+
+    - action=view   開啟預覽（預設）
+    - action=download  直接下載
+    """
+    action = (request.args.get('action', 'view') or 'view').strip().lower()
+    try:
+        import os
+        from utils.security import safe_join
+
+        reports_dir = os.environ.get('REPORTS_DIR', '/app/data/reports')
+        safe_path = safe_join(reports_dir, filename)
+
+        if not safe_path.exists() or not safe_path.is_file():
+            return '檔案不存在', 404
+
+        if safe_path.suffix.lower() != '.pptx':
+            return '不支援的檔案格式', 400
+
+        return send_file(
+            str(safe_path),
+            mimetype='application/vnd.openxmlformats-officedocument.presentationml.presentation',
+            as_attachment=(action == 'download'),
+            download_name=safe_path.name,
+        )
+    except ValueError:
+        return '非法路徑', 400
+    except Exception as e:
+        return f'{type(e).__name__}: {str(e)[:200]}', 500
+
+
 @admin_observability_bp.route('/api/health_indicator')
 @login_required
 def health_indicator_api():
diff --git a/templates/admin/ppt_audit_history.html b/templates/admin/ppt_audit_history.html
index 110a634..b53ffc8 100644
--- a/templates/admin/ppt_audit_history.html
+++ b/templates/admin/ppt_audit_history.html
@@ -136,6 +136,16 @@
   .status-warn { color: var(--obs-amber); }
   .status-bad { color: var(--obs-red); }
   .status-blue { color: var(--obs-blue); }
+  .ppt-file-actions {
+    display: flex;
+    gap: .4rem;
+    flex-wrap: wrap;
+  }
+  .ppt-file-actions .btn {
+    display: inline-flex;
+    align-items: center;
+    gap: .3rem;
+  }
   @media(max-width:1100px) {
     .ppt-command, .ppt-mini-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
     .ppt-grid { grid-template-columns: 1fr; }
@@ -266,7 +276,7 @@
         <div class="table-responsive">
           <table class="table table-sm mb-0">
             <thead class="table-light">
-              <tr><th>檔名</th><th class="text-end">KB</th><th>修改時間</th><th>狀態</th></tr>
+            <tr><th>檔名</th><th class="text-end">KB</th><th>修改時間</th><th>狀態</th><th>操作</th></tr>
             </thead>
             <tbody>
               {% for f in files %}
@@ -275,9 +285,19 @@
                 <td class="text-end">{{ f.size_kb }}</td>
                 <td><small>{{ f.mtime }}</small></td>
                 <td><small class="text-muted">22:00 排程掃描</small></td>
+                <td>
+                  <div class="ppt-file-actions">
+                    <a class="btn btn-outline-primary btn-sm" href="{{ url_for('admin_observability.ppt_audit_file', filename=f.name) }}" target="_blank" rel="noopener">
+                      <i class="fas fa-file-powerpoint me-1"></i>開啟
+                    </a>
+                    <a class="btn btn-outline-secondary btn-sm" href="{{ url_for('admin_observability.ppt_audit_file', filename=f.name, action='download') }}">
+                      <i class="fas fa-download me-1"></i>下載
+                    </a>
+                  </div>
+                </td>
               </tr>
               {% else %}
-              <tr><td colspan="4" class="text-center text-muted">本月無 {{ selected_report_type.label }} 簡報</td></tr>
+              <tr><td colspan="5" class="text-center text-muted">本月無 {{ selected_report_type.label }} 簡報</td></tr>
               {% endfor %}
             </tbody>
           </table>