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I want to convert a file of type application/octet-stream to.pcap. I tried using text2pcap but its output on terminal is 'Read 0 potential packets, wrote 0 packets'. Octet-stream does not refer to a specific type of file -- it could be anything from a spreadsheet to an executable program. To open an unidentified file, you need to either figure out which program can open the file as a document or change the file's extension to run as a program.