What are the first few bytes of the files (10 or so). That shouldn't give 
any IP away! There might be a recognisable header...

>>Hello all,
>>
>>We have been given responsibility for a large suite of technology from a
>>defunct US company (once owned by Cadence).  The schematics are in OrCad
>>capture (DSN) format, but the PCBs are unknown.  I thought either OrCad
>>Layout or Cadence Allegro but neither creates *.PCB files.
>>
>>Inspecting the binary PCB files gives no apparent clue (no helpful text
>>string embedded anywhere that gives any clues).
>>
>>So what mainstream, and probably high end, programs create PCB files with
>>a .PCB extension.  I have reason to believe that it was hosted on Windows
>>but even it may have been a Unix variant.
>>
>>It is not an option to send out a sample file (at least until we get
>>through the pile and find some of the low-IP test jigs).
>>
>>Not much to go on I know but has any one got any ideas?
>>
>>Many thanks and for those that celebrate different occasions at this time
>>of year, have a good one,
>>Ian Wilson
>


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