This message appears whenever I try to open a file downloaded from internet: can't be opened because it was not downloaded from the Mac App Store

Just bought a new Imac OX 10.9. Installed contents from previous Time Machine. All looks good. But, now, when I try to open any file downloaded from interent (like the Amazon mp3 downloader, for example or a plugin update) I get this message:
"XXX can’t be opened because it was not downloaded from the Mac App Store" . Help! Thanks

Got it solved! System preferences, security & privacy icon, general: allow apps downloaded from Mac Store and Identified developers! Phew!

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    Anonymous UUID:  243D9264-54B7-E9AE-2F83-D11098965D14

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    Report Version:  11
    Anonymous UUID:  243D9264-54B7-E9AE-2F83-D11098965D14

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