There is only one file type that uses the .XCSCHEME extension:
Xcode Scheme File
File used by Apple Xcode, an application that helps users develop iOS and Mac OS X applications; contains build, run, test, profile, analyze, and archive configuration information for your project.
The XCSCHEME file can be shared with other users or protected for a single user, which is useful for multi-developer projects. If the file is checked "Shared" in the "Manage Schemes" window, the file is stored in the xcshareddata/xschemes directory.
In order to edit, create, or manage your schemes, click the application icon in the top-left of your project window, and select, , or .
Updated: June 2, 2015