Adobe has issued a security advisory about a vulnerability in current and past versions of Adobe Flash Player for all platforms that could enable an attacker to take control of an affected system. The vulnerability is reportedly being exploited in the wild via a Flash (.swf) file embedded in a Microsoft Excel (.xls) document delivered as an email attachment. Adobe expects to release a fix next week, but until then, be very careful of Excel files in email. follow link
Open Files with App Switcher
Using the Application Switcher to open files can sometimes be faster than hunting for an Application's window or searching through a jam packed Dock for an Application's icon. First grab your file, press Command-Tab, and then drop the file onto the desired application's icon to open it within that program.
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Beware Excel Files Bearing Flash Vulnerabilities