: Use software like WinRAR or 7-Zip to extract the downloaded file. This will usually give you a .smv file or a similar format.
For the PC version of FIFA 12, commentary is typically stored as .big files within the game directory. Fifa 12 Commentary Download Fixed
: In the commentary folder, you'll find existing commentary files. Backup these files (in case you want to revert). Then, place your downloaded commentary file(s) into this folder.