src/jdk.incubator.jpackage/windows/classes/jdk/incubator/jpackage/internal/WixSourcesBuilder.java

@@ -475,11 +475,11 @@
                 }
 
                 xml.writeStartElement("Verb");
                 xml.writeAttribute("Id", "open");
                 xml.writeAttribute("Command", "Open");
-                xml.writeAttribute("Argument", "%1");
+                xml.writeAttribute("Argument", "\"%1\"");
                 xml.writeAttribute("TargetFile", Id.File.of(fa.launcherPath));
                 xml.writeEndElement(); // <Verb>
 
                 xml.writeEndElement(); // <Extension>
             }));