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I'm struggling to open some old .sch and .pcb files from out PCBA supplier in Altium17 or Altium18. Our supplier says the files were probably created in Protel 99. No combination of opening the files or importers in Altium have worked thus far. What should I do?
Open the file in a hex viewer, look at the magic bytes.https://en.wikipedia.org/wiki/List_of_file_signatures