NOTEPAD, close NOTEPAD and do not save/make any changes. 2) Open \'my computer\'. Goto VIEW > FOLDER OPTIONS > FILE TYPES. In this list, look for \"DMOD FILE\" (or \"DMOD\"), without the quotes. Select it then press EDIT. 3) Select OPEN (which should be in bold), then press EDIT. In the \'Application used to perform action\' text box, type the following: \"f:\\\\system\\setup.exe\" install \"%1\" Where f:\\ is the drive with Deus Ex installed, and is the directory to it. Then press OK three times, and you should be able to open DMOD\'s!