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For questions about Gatekeeper, a security feature in Mountain Lion that only allows certain applications to be opened. The default setting is to allow only Mac App Store and trusted developer applications.

12 votes

Why is OSX telling me I can't open a document from an unidentified developer?

This is probably because the file was downloaded from the internet; Safari marks it as quarantined to make it harder for malware to execute. You can test this easily by doing xattr <file> and checki …
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