I copied an AVCHD format movie to my computer but I cannot play it back on my computer.

If the operating system on your computer is Windows Vista or earlier, you cannot play AVCHD format movies directly via Explorer, etc. To play them back, compatible playback software needs to be installed to your computer.

Movie files can be read/played back by using the PlayMemories Home software.

NOTE: 3D movies recorded with the 3D-compatible camcorder are played back as 2D movies on the computer if you use the PlayMemories Home software Ver.1.0.10 or older. To play back 3D movies, update the PlayMemories Home software to Ver.1.2.00 or higher. If you write them back to the camcorder, they are played back as 3D movies.
Use the PlayMemories Home software Ver.1.3.02 or newer on a Windows 8 computer.