Mac book air not reading files on external hard disc.

Whenever I connect my external hard disc ( Transcend 1 TB, Ms DOS) to my macbook air (OS X 10.9.3, 1.3 GHz intel core i5, 4GB 1600 MHz) its icon appears on the desktop but I can not open the files saved on it. When I try to open the music files lets say, this message appears: "You can’t open the application because Microsoft Windows applications are not supported on OS X." Also, it worked properly a while ago. What shall I do?

What file extension(s) do these music files have at the end of their names?

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