You add the .idx file as the subtitle file. The .idx file itself points to the associated .sub file, so you don't have to tell ffmpegX about the .sub file. Note: this only works for encodings with the 'DVD mpeg2enc' preset and 'Decode with mplayer' activated.
Tonight is the night- Game of Thrones, season 6, premieres on HBO. The show begins at 8 p.m. CST, and will last for one hour.
Their last deal, in October 2014, also saw them net hefty raises with an option for season seven. Game of Thrones ranks as HBO's most-watched series ever and is the premium outlet's longest-running show currently on the air. For full coverage, bookmark THR.com/GameOfThrones.