diff --git a/lib/shell.js b/lib/shell.js
index 6ff3027..3b2301b 100644
--- a/lib/shell.js
+++ b/lib/shell.js
@@ -2,6 +2,9 @@
 // Shell API
 ////////////////////////////////////////////////////////////////////////
 var FILE = require("lib/file");
+var RAND = require("lib/rand");
+
+var SEED = RAND.getSeed();
 
 var ShellObject = function() {
     this.interface = null;
@@ -68,9 +71,8 @@ var ShellObject = function() {
 
     this.exec = function(cmd, stdOutPath, stdErrPath) {
         var stdout, stderr;
-        var seed = parseInt(Math.random() * 10000);
-        var stdOutPath = (typeof(stdOutPath) === "undefined" ? "tmp\\stdout_" + seed + ".txt" : stdOutPath);
-        var stdErrPath = (typeof(stdErrPath) === "undefined" ? "tmp\\stderr_" + seed + ".txt" : stdErrPath);
+        var stdOutPath = (typeof(stdOutPath) === "undefined" ? "tmp\\stdout_" + SEED + ".txt" : stdOutPath);
+        var stdErrPath = (typeof(stdErrPath) === "undefined" ? "tmp\\stderr_" + SEED + ".txt" : stdErrPath);
 
         var c = "%comspec% /c (" + this.build(cmd) + ") 1> " + stdOutPath;
         //c += " 2>&1";
@@ -192,6 +194,6 @@ exports.getPathOfMyDocuments = function() {
     return (new ShellObject()).getPathOfMyDocuments();
 };
 
-exports.VERSIONINFO = "Shell interface (shell.js) version 0.2";
+exports.VERSIONINFO = "Shell interface (shell.js) version 0.3";
 exports.global = global;
 exports.require = global.require;