Mac OS X: Disable the File Extension Change Warning in Finder

A good tip from OSXDaily.com: Disable the File Extension Change Warning in Finder.

First, open the Terminal, located within the /Applications/Utilities/ directory, then copy and paste in the following command:
defaults write com.apple.finder FXEnableExtensionChangeWarning -bool false

Follow that up by relaunching the Finder with killall:
killall Finder

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