The .cid file extension is used by a variety of software applications. It is most commonly associated with the Navigator astronomy software to store chart image descriptions. The .cid file extension is also used for AnalogX CallerID files and coDiagnostiX user defined implant files.
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If you have additional information about the CID file format or software that uses files with the CID suffix, please do get in touch - we would love hearing from you.