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Ever since OS X 10.7.3, my text editor is setting the "quarantine" bit on any file it touches. My text editor is designed for working with shell scripts, and if the quarantine bit is set then a shell script cannot be executed from the command line, until you double click it in Finder and go through a "This application was downloaded from the internet" alert (or remove the quarantine bit with xattr ). For example, I just created a "hello world" script in my app, it has been quarantined, and cannot be executed: $ xattr -l foo com.apple.quarantine: 0006;4f51dd2f;Dux; $ chmod +x foo $ ./foo -bash: ./foo: Operation not permitted If I remove the quarantine bit, the script works: $ xattr -d com.apple.quarantine foo $ ./foo hello world According to some forum posts, TextEdit also sets the quarantine bit on any shell script it creates. I'm using a simple NSDocument subclass to create the file: - (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError { return [self.textStorage.string dataUsingEncoding:self.stringEncoding]; } How can I remove the quarantine bit from files created in my app? Other text editors, such a TextWrangler , do not set the quarantine bit. UPDATE A little more info, this only occurs when creating a "script application" file, which is anything from perl scripts to html. And it only occurs when my app is sandboxed. Disabling sandboxing fixes the problem, but that's not a long term solution. I've filed a bug with Radar, it looks like there might be nothing to do but wait/hope that avenue gets it fixed.

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