ProEngineer file formats

OPEN FILE /ON THE OPEN FILE DIALOGE BOX, CLICK ON THE DROP DOWN ARROW ON TYPE. YOU WILL SEE ALL THE TYPE OF FILES PROE CAN OPEN. IF YOUR FILE NAME HAS A SPACE, PRO-E WILL NOT LIST IT. EDIT THE FILE NAME IN EXPLORER TO REMOVE THE SPACE OR TYPE IN UNDERSCORE IN PLACE OF THE SPACE.