.XCCONFIG File Extension
Xcode Configuration Settings File
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What is an XCCONFIG file?
Configuration file created by Xcode, a Mac OS X software development application; stores parameters for configuring the build of Xcode projects; can be referenced by multiple Xcode projects to use the same build settings.
To create the XCCONFIG file, open the project you want to create the XCCONFIG file for, select File → New → File..., choose "Other" (under iOS and OS X), select "Configuration Settings File," name the file, choose the save location, and click Create.