From: "Doan, Alex" Date: 2007-09-25T03:27:39+09:00 Subject: Re: Calling Exec() in Windows versus UNIX > However, moving it over to Windows and trying to run: > exec("charting\RequestByProject.jar",params[:name]') You're escaping the 'R' in the above command. You can leave it exec("charting/RequestByProject.jar",params[:name]') and it would still work on window.