I have some files with the .prp extension which comes from an export from another CAD program ¿Does anybody knows what is the use of this files? ¿What is the information contained? Another thing: When I open the dgn files (remember it comes from an export in other, unknowed program) the icon of the view for change the point of view (you know, that of the box) does not rotate, only can change zoom over the view... ¿Any advice? Thanks folks...