Why does nikon view NX 2 say unsupported file type whenever I try to open a.mov video?

I shot the video with my nikon l120 so I would think this nikon program would be compatible. I watched the video on view NX 2 and it worked fine, but hours later I try opening it and it just said unsupported file type. I've tried deleting it and uploading it from my camera again and it still wouldn't let me. Any suggestions?

Added (1). What do you mean by install the right codec?

View NX by default supports.mov, try updating/installing Quicktime from Apple and restarting.

You don't have Quicktime installed in your Windows PC. Install the right codec in your media player or install Apple Quicktime in your computer.