Kaleidoscope supports .zc and .00# zero-crossing files. Zero-Crossing Archives (.zca files) must be unpacked into individual recordings before they can be processed by Kaleidoscope.
Zero-Crossing Archive files are a format that stores multiple zero-crossing recordings together as a single archive file. Wildlife Acoustics recorders do not use this format.
If you use a device that produces .zca files, consult that device's manufacturer for recommendations on unpacking the files into individual zero-crossing recordings.