There is only one file type that uses the .X4K extension:
XML4King Configuration File
File used by XML4King, a program used to convert .XLS or .CSV files from Microsoft Excel into .XML files that are usable by King Business Software; contains a collection of field mappings that map an Excel column in a source file to a field name from the King Business Software database.
X4K files are saved in a plain text format.
|Optimal Performance XML4King|
Updated: October 10, 2009