From 104816e462446d6a5c6e4994e6de570a2f8be930 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 12 Jul 2011 12:34:28 -0600
Subject: [PATCH] ...

---
 src/calibre/utils/ipc/launch.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/calibre/utils/ipc/launch.py b/src/calibre/utils/ipc/launch.py
index 70be0ceb0d..270f43dd6b 100644
--- a/src/calibre/utils/ipc/launch.py
+++ b/src/calibre/utils/ipc/launch.py
@@ -18,7 +18,9 @@ if iswindows:
     try:
         _windows_null_file = open(os.devnull, 'wb')
     except:
-        raise RuntimeError('NUL %r file missing in windows'%os.devnull)
+        raise RuntimeError('NUL file missing in windows. This indicates a'
+                ' corrupted windows. You should contact Microsoft'
+                ' for assistance.')
 
 def renice(niceness):
     try: