diff -r 3485327d3080 -r 70d15cf323ba launcher/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java
--- a/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java	Sun Dec 23 23:30:06 2012 +0100
+++ b/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java	Tue Dec 25 14:07:02 2012 +0100
@@ -149,7 +149,7 @@
                 
                 if (id != null && value != null) {
                     LOG.log(Level.INFO, "Received result for case {0} = {1}", new Object[]{id, value});
-                    value = value.replace("%20", " ");
+                    value = decodeURL(value);
                     cases.get(Integer.parseInt(id)).result(value, null);
                 }
                 
@@ -253,6 +253,17 @@
         }
     }
     
+    private static String decodeURL(String s) {
+        for (;;) {
+            int pos = s.indexOf('%');
+            if (pos == -1) {
+                return s;
+            }
+            int i = Integer.parseInt(s.substring(pos + 1, pos + 2), 16);
+            s = s.substring(0, pos) + (char)i + s.substring(pos + 2);
+        }
+    }
+    
     private void stopServerAndBrwsr(HttpServer server, Object[] brwsr) throws IOException, InterruptedException {
         Process process = (Process)brwsr[0];