There is only one file type that uses the .XMLFF extension:
XML Flat File
Database file format developed by Control Split; contains XML schema merged with Python arrays in plain text format.
The XMLFF format is similar to XML but also supports data that is not encased within a parent child schema. The purpose of the format is to work with database methods in .PY files and to provide users with an open source flat file database solution.
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Updated: January 28, 2016