PCB (file format)
From GICLWiki
Extension: .pcb
Company: Accel EDA
Extension: PCB
Program and/or Extension Function: ExpressPCB Printed Circuit Board Layout
Company: ExpressPCB
Specific Notes: Free PCB software.
File Classification: CAD/CAM
Identifying Characters: (None or Unknown)
Program ID: (None or Unknown)
General Notes: (None)
Extension: PCB
Program and/or Extension Function: P-CAD Database
Company: Altium Limited
Specific Notes: (None)
Identifying Characters: (None or Unknown)
Program ID: (None or Unknown)
General Notes: (None)