diff --git a/qt/aqt/editor.py b/qt/aqt/editor.py
index 53be64bcb..073696c9a 100644
--- a/qt/aqt/editor.py
+++ b/qt/aqt/editor.py
@@ -1346,6 +1346,10 @@ class EditorWebView(AnkiWebView):
         if not mime.hasHtml():
             return
         html = mime.html()
+        if is_win and qtmajor == 6:
+            # workaround Qt including CF_HTML header in clipboard
+            # FIXME: remove after we switch to Qt 6.2.5/6.3.1+.
+            html = re.sub(r"^Version:0.9(.|\r|\n)+?SourceURL:.*?\r\n", "", html)
         mime.setHtml(f"<!--anki-->{html}")
         aqt.mw.progress.timer(10, lambda: clip.setMimeData(mime), False, parent=self)