What are the significance of the letters beside the files in the Project Navigator? (e.g M,A)
Tags such as "M" or "A" next to files in Xcode indicates that your project in under SVN/GIT repository. "M" indicates content of file Modified whereas "A" for file Added.
M = Locally modified U = Updated in repository A = Locally added D = Locally deleted I = Ignored R = Replaced in the repository – = The contents of the folder have mixed status; display the contents to see individual status ? = Not under source control.
Since M files are objective-c files, they are used for the implementation of Apple's Mac OS X and iOS operating system applications. There are many applications that can open M files and one of the most popular applications used is the Apple Xcode by which M files are considered part of its projects.
For a single file, you can open the external file in Xcode and cmd + s to save it, it will be refreshed in Xcode. Also, for the quick way you can just chose the external folder in Xcode and cmd + s , it will refresh all your external file in this folder.
Those letters beside files in the Project Navigator of Xcode show the status of files that are under version control systems, such as SVN or Git. So, for instance:
P.S. You can find list of statuses (at least for SVN) here
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