Updated runtime files.
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 97c4525..35f6c49 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt* For Vim version 7.3. Last change: 2011 May 10
+*message.txt* For Vim version 7.3. Last change: 2013 Feb 23
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -730,7 +730,11 @@
Can't open file {filename}
Can't read file {filename}
-Vim cannot read a temporary file.
+Vim cannot read a temporary file. Especially on Windows, this can be caused
+by wrong escaping of special characters for cmd.exe; the approach was
+changed with patch 7.3.443. Try using |shellescape()| for all shell arguments
+given to |system()|, or explicitly add escaping with ^. Also see
+'shellxquote' and 'shellxescape'.
*E464* >
Ambiguous use of user-defined command