The .pcb file extension is most commonly associated with the Microsoft PowerPoint presentation software. The PCB files contain the application settings and data that are used by the software.
The .pcb file extension is also used for ACCEL or Protel printed circuit board files, P-CAD database files, PC-Doctor files, Broderbund Print Shop business card files and PCB Layout check design rule template files.
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If you have additional information about the PCB file format or software that uses files with the PCB suffix, please do get in touch - we would love hearing from you.