--- a/src/Pure/Admin/build_sqlite.scala	Fri Jan 20 21:52:29 2023 +0100
+++ b/src/Pure/Admin/build_sqlite.scala	Fri Jan 20 21:56:34 2023 +0100
@@ -50,7 +50,7 @@
 
     /* jar */
 
-    val jar = component_dir.lib + Path.basic(download_name).ext("jar")
+    val jar = component_dir.lib + Path.basic(download_name).jar
     Isabelle_System.make_directory(jar.dir)
     Isabelle_System.download_file(download_url, jar, progress = progress)