[Answer ID: 14952]
How to Get Around the "App Can't be opened because..." Error in OS X
Depending on OS X (starting with Mountain Lion and OS X Lion v10.7.5) Gatekeeper (security settings), when you try to open or download an application software from Buffalo Technology website www.buffalotech.com, you may get an alert message such as below to protect your Mac against malware.
"App name" can't be opened because it was not downloaded from the Mac App Store
"App name" can't be opened because it is from an unidentified developer
An alert message may not be displayed depending on your security settings.
Right-click or click the app while holding down the control key, then click [Open].
Click [Open] at the next dialog warning.
Follow the instruction on the screen.