There is only one file type that uses the .KIX extension:
KiXtart Script File
Script written in KiXtart, a free-format scripting language; includes built-in functionality for easy scripting and supports Active Directory Services Interface (ADSI), ActiveX Data Objects (ADO), and Windows Management Instrumentation (WMI) functions.
KiXtart scripts can be used to check user login credentials, automate software installations, create small games, and for many other purposes.
NOTE: KIX files are saved in a text format that can be viewed and edited in a text editor. They are run by the KiXtart application (kix32.exe).
Updated: September 2, 2018