Open XCSCHEME File
An XCSCHEME file extension is associated with Xcode application development software. The file type is specifically used by developers who code applications for Apple devices using the languages like Swift and Objective-C. It is this file that stores settings for building, running, testing or profiling tools. Reports are generated by Xcode named as bug reports and are identified with .xcsceme file extension. Xcode is developed and distributed by Apple Inc. and is free to download and use for both personal and commercial use. You can get more details about Xcode here.
Opening XCSCHEME files
In general, if you have an XCSCHEME file, it should be opened in Xcode as default. However, these are just text files with XML formatting. Thus, if needed, it can also be opened with any text editor like Sublime Text, Notepad++, or Atom. If you are a developer and use Xcode as your IDE then the link will be useful - Apple Xcode Workspaces.
Modifying XCSCHEME FileType
Although it’s rare, developers sometimes might want to modify the XCSCHEME file. This requires a good understanding of the XML structure and familiarity with Xcode. Not following the proper formatting can lead to errors in the project. This is why developers are often cautioned against modifying the XCSCHEME files. Here is a helpful link about this topic from the Stack Overflow community.
XCSCHEME File Important Information
Overall, the XCSCHEME format really is specifically for those into development with Apple's Xcode IDE. To recap, an .xcsceme file contains the settings for various actions that can be run within the Xcode IDE environment. The files are used to specify how to execute one or more targets in one or more Projects or Workspaces, including how to build them, what to build them with, and where the generated build products should go. However, always be wary of editing these files outside of the Xcode environment as you can potentially harm your projects if done incorrectly. For more detailed information about XCSCHEME file format, you may visit FileInfo's XCSCHEME extension page.