Mentor Expedition uses a .PCB extension but there are several networked support folders that are part of the database. If your data is a single file, it cannot be Expedition. Maybe Pads? sjchar3@xxxxxxxxxxxx Sent by: icu-pcb-forum-bounce@xxxxxxxxxxxxx 05/23/2007 12:42 PM Please respond to icu-pcb-forum@xxxxxxxxxxxxx To icu-pcb-forum@xxxxxxxxxxxxx cc Subject [PCB_FORUM] pcad viewer 206 I downloaded a 2006 version of PCAD viewer. I have a board from a vendor but I can't seem to open the board. Anyone know of another PCB software that uses a .PCB extension. The board was downloaded from a website. I wonder if allegro will import it in. SAm Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.