diff --git a/app-proto/run-examples b/app-proto/run-examples.sh
old mode 100755
new mode 100644
similarity index 86%
rename from app-proto/run-examples
rename to app-proto/run-examples.sh
index b3e3121..50fafbe
--- a/app-proto/run-examples
+++ b/app-proto/run-examples.sh
@@ -1,5 +1,3 @@
-#!/bin/sh
-
 # run all Cargo examples, as described here:
 #
 #   Karol Kuczmarski. "Add examples to your Rust libraries"