diff --git a/locales/en.json b/locales/en.json
index 44b6924d7..e626ca477 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -1411,6 +1411,7 @@
   "sessions.fileViewer.openFile": "Open file",
   "sessions.fileViewer.path": "File path",
   "sessions.fileViewer.pathCopied": "File path copied",
+  "sessions.fileViewer.pathCopyFailed": "Failed to copy file path",
   "sessions.fileViewer.preview.show": "Preview",
   "sessions.fileViewer.preview.hide": "Hide preview",
   "sessions.fileViewer.refresh": "Refresh",
diff --git a/locales/zh_CN.json b/locales/zh_CN.json
index 34f61a95c..a29983c7b 100644
--- a/locales/zh_CN.json
+++ b/locales/zh_CN.json
@@ -1411,6 +1411,7 @@
   "sessions.fileViewer.openFile": "打开文件",
   "sessions.fileViewer.path": "文件路径",
   "sessions.fileViewer.pathCopied": "文件路径已复制",
+  "sessions.fileViewer.pathCopyFailed": "复制文件路径失败",
   "sessions.fileViewer.preview.show": "预览",
   "sessions.fileViewer.preview.hide": "退出预览",
   "sessions.fileViewer.refresh": "刷新",
diff --git a/packages/components/src/components/sessions/session-file-content-view.tsx b/packages/components/src/components/sessions/session-file-content-view.tsx
index 559b2ad24..8429454b2 100644
--- a/packages/components/src/components/sessions/session-file-content-view.tsx
+++ b/packages/components/src/components/sessions/session-file-content-view.tsx
@@ -1,5 +1,6 @@
 import { memo, useCallback, useEffect, useMemo, useRef, useState, type ReactNode } from 'react';
 import {
+  ClipboardCopy,
   Copy,
   Eye,
   EyeClosed,
@@ -892,6 +893,17 @@ function SessionFileContentViewImpl({
       );
     }
   }, [data, normalizedPath, tRef]);
+  // SP28: the desktop viewer had no way to get at the path it is showing.
+  // `MobileFileViewerDrawer` has carried this action since it landed, under the
+  // same `sessions.fileViewer.copyPath` key.
+  const handleCopyFilePath = useCallback(async () => {
+    const copied = await writeTextToClipboard(normalizedPath);
+    if (copied) {
+      toast.success(tRef.current('sessions.fileViewer.pathCopied', 'File path copied'));
+    } else {
+      toast.error(tRef.current('sessions.fileViewer.pathCopyFailed', 'Failed to copy file path'));
+    }
+  }, [normalizedPath, tRef]);
   const lastCopyMarkdownRequestSeqRef = useRef(copyMarkdownRequestSeq ?? 0);
   useEffect(() => {
     if (
@@ -1300,12 +1312,16 @@ function SessionFileContentViewImpl({
     isTextFileReady && !showSvgRendered && !showMarkdownRendered && !showHtmlRendered;
   const showSaveButton = isProviderFileEditable && isTextFileReady;
   const showRefreshButton = shouldUseProviderFileContent && isTextFileReady;
+  // The path is knowable for every file the viewer can show, binary previews
+  // included, so this control has no condition of its own.
+  const showCopyPathButton = normalizedPath.length > 0;
   const showViewerTopBar =
     showPreviewToggle ||
     isMarkdownTextFile ||
     showSearchButton ||
     showSaveButton ||
-    showRefreshButton;
+    showRefreshButton ||
+    showCopyPathButton;
 
   return (
     <div className={cn('flex h-full min-h-0 flex-col overflow-hidden', className)}>
@@ -1409,6 +1425,17 @@ function SessionFileContentViewImpl({
                 <WrapText className="h-3.5 w-3.5" aria-hidden="true" />
               </button>
             ) : null}
+            {showCopyPathButton ? (
+              <button
+                type="button"
+                onClick={() => void handleCopyFilePath()}
+                title={t('sessions.fileViewer.copyPath', 'Copy file path')}
+                aria-label={t('sessions.fileViewer.copyPath', 'Copy file path')}
+                className="flex h-6 w-6 items-center justify-center rounded text-muted-foreground transition-colors hover:bg-accent hover:text-foreground"
+              >
+                <ClipboardCopy className="h-3.5 w-3.5" aria-hidden="true" />
+              </button>
+            ) : null}
             {showSearchButton ? (
               <button
                 type="button"