From 3b6139ed234a118a45e17adcc6e46c15965f88ac Mon Sep 17 00:00:00 2001
From: Jonathan Durand <38976316+jdugh@users.noreply.github.com>
Date: Fri, 16 Jan 2026 20:14:56 +0100
Subject: [PATCH] Revert dynamic file extension detection to hardcoded 'jpg'
 (#218)

---
 src/index.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index b55704a..d8c33d6 100755
--- a/src/index.js
+++ b/src/index.js
@@ -1454,7 +1454,12 @@ class Workbook {
         }
         this.initRichData();
         const maxFildId = this.findMaxFileId(/xl\/media\/image\d*\..*/, /image(\d*)\./);
-        const fileExtension = substitution.split('.').pop();
+        /**
+         * Setting extension back to "jpg" which works for all image formats
+         * for now. Proper extension detection will be addressed in a future PR
+         * with appropriate testing.
+         */
+        const fileExtension = "jpg";
         try {
             substitution = this.imageToBuffer(substitution);
         }