MUSIC PROBLEM

Alright, so a while ago I composed some music in FL Studio 10. It was made into a .wav file, so i wanted to use it in RPG XP, but I imported it, it got imported, but it would not play sound, I imported a song from a CD i had bought and it WOULD play sound, is there like some kind of codec or something I have to do when I export my songs to be able to be played with RPG XP?? I would like to know please, I hate using other peoples music in my projects, (you know not that I hate other peoples work, I just like to know that I did some of my own work)