First, make sure that the file you want to play is a .ram, .rmm, .ra, .rax, .rv., .rvx, .rm, .rmx, .rmvb, .rmd, .rmj, .rms, .rp, .rt, .mp3, .mp2, .m4a, .mp4, .mpg, .mpeg, .smil, .smi, .mov, .qt, or .avi file. After that, update the program and try again. If it doesn't work, install Combined Community Codec Pack and check if you can play the file using VLC Media Player. If it doesn't work, it's possible that the file you want to open is corrupted.