diff --git a/apps/web/src/components/DiffFilePathCopyButton.browser.test.tsx b/apps/web/src/components/DiffFilePathCopyButton.browser.test.tsx
index 1a0b4238f5f6e..0c5d46395f3ae 100644
--- a/apps/web/src/components/DiffFilePathCopyButton.browser.test.tsx
+++ b/apps/web/src/components/DiffFilePathCopyButton.browser.test.tsx
@@ -8,7 +8,7 @@ import { AnchoredToastProvider } from "./ui/toast";
 it("explains a denied clipboard write and lets the same path be copied again", async () => {
   await using screen = await render(
     <AnchoredToastProvider timeout={0}>
-      <DiffFilePathCopyButton filePath="apps/web/src/index.ts" />
+      <DiffFilePathCopyButton filePath="apps/web/src/index.ts" workspaceRoot="/repo" />
     </AnchoredToastProvider>,
   );
   using write = vi
@@ -28,3 +28,16 @@ it("explains a denied clipboard write and lets the same path be copied again", a
   expect(write).toHaveBeenCalledTimes(2);
   expect(write).toHaveBeenLastCalledWith("apps/web/src/index.ts");
 });
+
+it("copies a Windows workspace's file path with Windows separators", async () => {
+  await using screen = await render(
+    <AnchoredToastProvider timeout={0}>
+      <DiffFilePathCopyButton filePath="apps/web/src/index.ts" workspaceRoot="C:\repo" />
+    </AnchoredToastProvider>,
+  );
+  using write = vi.spyOn(navigator.clipboard, "writeText").mockResolvedValue(undefined);
+
+  await screen.getByRole("button", { name: "Copy file path" }).click();
+
+  await vi.waitFor(() => expect(write).toHaveBeenCalledWith("apps\\web\\src\\index.ts"));
+});
diff --git a/apps/web/src/components/DiffFilePathCopyButton.tsx b/apps/web/src/components/DiffFilePathCopyButton.tsx
index 59aa256294d85..c2beef232e8ac 100644
--- a/apps/web/src/components/DiffFilePathCopyButton.tsx
+++ b/apps/web/src/components/DiffFilePathCopyButton.tsx
@@ -1,3 +1,4 @@
+import { formatFilePathForClipboard } from "@t3tools/client-runtime/media-actions";
 import { CheckIcon, CopyIcon } from "lucide-react";
 import { useRef } from "react";
 import { useCopyToClipboard } from "../hooks/useCopyToClipboard";
@@ -5,7 +6,13 @@ import { ANCHORED_COPY_TOAST_TIMEOUT_MS, showAnchoredCopyErrorToast } from "./ui
 import { Button } from "./ui/button";
 import { Tooltip, TooltipPopup, TooltipTrigger } from "./ui/tooltip";
 
-export function DiffFilePathCopyButton({ filePath }: { filePath: string }) {
+export function DiffFilePathCopyButton({
+  filePath,
+  workspaceRoot,
+}: {
+  filePath: string;
+  workspaceRoot: string | undefined;
+}) {
   const ref = useRef<HTMLButtonElement>(null);
   const { copyToClipboard, isCopied } = useCopyToClipboard<void>({
     onError: (error) => showAnchoredCopyErrorToast(ref, error),
@@ -21,7 +28,9 @@ export function DiffFilePathCopyButton({ filePath }: { filePath: string }) {
             size="icon-micro"
             variant="ghost-muted"
             aria-label="Copy file path"
-            onClick={() => copyToClipboard(filePath, undefined)}
+            onClick={() =>
+              copyToClipboard(formatFilePathForClipboard(filePath, workspaceRoot), undefined)
+            }
           />
         }
       >
diff --git a/apps/web/src/components/DiffPanel.tsx b/apps/web/src/components/DiffPanel.tsx
index 99e0b07c1845e..71c197b6ce363 100644
--- a/apps/web/src/components/DiffPanel.tsx
+++ b/apps/web/src/components/DiffPanel.tsx
@@ -177,12 +177,14 @@ function DiffFileCollapseToggle({
 
 function DiffFileHeaderSuffix({
   filePath,
+  workspaceRoot,
   hasStat,
   error,
   truncated,
   onRetry,
 }: {
   filePath: string;
+  workspaceRoot: string | undefined;
   hasStat: boolean;
   error: boolean;
   truncated: boolean;
@@ -191,7 +193,7 @@ function DiffFileHeaderSuffix({
   return (
     <>
       <span data-diff-copy-path className="inline-flex">
-        <DiffFilePathCopyButton filePath={filePath} />
+        <DiffFilePathCopyButton filePath={filePath} workspaceRoot={workspaceRoot} />
       </span>
       {hasStat ? (
         <DiffFileStatus error={error} truncated={truncated} retry={() => onRetry(filePath)} />
@@ -1436,6 +1438,7 @@ export default function DiffPanel({
                       return (
                         <DiffFileHeaderSuffix
                           filePath={path}
+                          workspaceRoot={activeCwd}
                           hasStat={fileStats.has(path)}
                           error={state?.error ?? false}
                           truncated={state?.truncated ?? false}