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What is an XCODEPROJ file?
An XCODEPROJ file is a software development project created with Apple Xcode, an IDE for macOS. It is a macOS package that stores all of the information for the project, including references to source files (such as source code, resources, and image files) and project configuration data (such as debug and release build settings). Xcode users save the software they are developing for macOS, iOS, watchOS, or tvOS as XCODEPROJ files to preserve their progress, then compile their software projects into executable apps for distribution.
Xcode is a free IDE that Apple offers on the Mac App Store. It provides various tools for building, testing, deploying, and reviewing user feedback regarding apps.
As you develop your software with Xcode, you can save it as an XCODEPROJ file, which allows you to close it and re-open it for further editing. To create an XCODEPROJ file with Xcode, select File → New → Project. Then, when you finish developing your software, you can choose Product → Build to compile the source code and build an executable .APP file.
How to open an XCODEPROJ file
You can open XCODEPROJ files with Apple Xcode in macOS. For example, to open a XCODEPROJ file, select File → Open.
Opening an XCODEPROJ file as a macOS package
In macOS, you can right-click an XCODEPROJ file and select Show Package Contents to view the package's directories and files with Apple Finder. Files you may find stored within an XCODEPROJ file include .PBXPROJ, .XCWORKSPACE, and .PLIST files.
NOTE: Modifying the contents in an XCODEPROJ file may corrupt the project.