To open Catia without opening a new document at startup, you need to set an environment variable in Windows XP. As a default, Catia will start each new session with a CATProduct file. Following this procedure will allow the user to turn the default document option off, and eliminate the need to close the file, and open (or start) a different file. Step 1 Open the “Control Panel.” (under the “Start” tab in Windows) Double click on “System” Step 2 Select the tab labeled “Advanced.” Click on the “Environmental Variables” button at the bottom of the panel. Step 3 Create a new variable, and call it “CATNoStartDocument.” (exactly as shown) Assign a value of “1.” Click “OK” to accept, and exit the control panel. When you open a new session of Catia, you should have a blank session. No more empty document of any kind when each session begins.