.DS_STORE File Extension
Mac OS X Folder Settings File
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What is a DS_STORE file?
A DS_STORE file contains viewing preferences for a folder in macOS (Mac OS X). It stores information about the folder's window location, window size, what view option has been selected (icon, list, or column), and the layout of icons in the window.
DS_STORE files are usually invisible, but may become visible when copied over a network, copied to a Windows computer, or restored from a backup. The DS_STORE file can be deleted from within a folder without affecting any of the data inside the folder. If the DS_STORE file is removed, the folder will open using the Finder's default view settings.
NOTE: DS stands for "Desktop Services."