Files with QCI extension are phonebook  indexes used in old Cliq program for Linux/Unix.

There is one other file type using
the QCI file extension!

empty icon.qci - Massively Parallel Quantum Chemistry Program file

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QCI file - Cliq accessories phonebook index

What is qci file? How to open qci files?

File type specification:

Various data file type icon Various data file type

The QCI file extension is mainly related to older program called Cliq that was used mainly on Unix or Linux OS. Most likely obsolete and no longer used. Originally developed by Quadratron Systems. 

Help how to open QCI files:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert file with extension QCI:

As far as we know, this .qci file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

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