I have tried to open some .pcb and .sch files with Kicad. But there’s always an error showed up. Dose anyone have same experience. 
.pcb and .sch are generic extensions that have no meaning. KiCad can only open KiCad files of .kicad_sch and .kicad_pcb.
However KiCad can import one way files like EAGLE .pcb and .sch, for that you have to use the Import option instead of open
Hey, thanks for answering. I have tried :File->Import->Non-Kicad board file. And it shows the same error.
Sounds like its a file format we don’t support, potentially allegro or something
All I know is that it dosen’t work at Altium either.
Hello @LF666,
Importing external files is explained in one of the documents I provided a link for in a previous thread of yours.
Please read the documentation.
Kicad has nothing to do with Altium. Please refer to Altium for Altium problems.
Generally you can open files with a text editor to look for clues of which program it was created with.
Many (most?) PCB software packages have used the same file extensions over the years.
Text and hex editors are good at looking at these files for clues for what was used
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