From 38a8406a66a5d37c403d1dbd09d7e1a62affff15 Mon Sep 17 00:00:00 2001
From: Joe Boccanfuso <109477394+jbocce@users.noreply.github.com>
Date: Tue, 6 Jan 2026 15:27:44 -0500
Subject: [PATCH] fix(capture): Ensure download filename has the correct
 extension. (#5691)

---
 .../src/utils/CornerstoneViewportDownloadForm.tsx            | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/extensions/cornerstone/src/utils/CornerstoneViewportDownloadForm.tsx b/extensions/cornerstone/src/utils/CornerstoneViewportDownloadForm.tsx
index c10ff01d0..0d4c72b50 100644
--- a/extensions/cornerstone/src/utils/CornerstoneViewportDownloadForm.tsx
+++ b/extensions/cornerstone/src/utils/CornerstoneViewportDownloadForm.tsx
@@ -215,7 +215,7 @@ const CornerstoneViewportDownloadForm = ({
     }
   }, [viewportDimensions, showAnnotations]);
 
-  const handleDownload = async (filename: string, fileType: string) => {
+  const handleDownload = async (baseFilename: string, fileType: string) => {
     const divForDownloadViewport = document.querySelector(
       `div[data-viewport-uid="${VIEWPORT_ID}"]`
     );
@@ -225,8 +225,9 @@ const CornerstoneViewportDownloadForm = ({
       return;
     }
 
+    const filename = `${baseFilename}.${fileType}`;
     const canvas = await html2canvas(divForDownloadViewport as HTMLElement);
-    downloadUrl(canvas.toDataURL(`image/${fileType}`, 1.0));
+    downloadUrl(canvas.toDataURL(`image/${fileType}`, 1.0), { filename });
   };
 
   const ViewportDownloadFormNew = customizationService.getCustomization(