m3u file default application

I'm not sue where the source of this problem is, but when I open an M3U file (via Astro) and tell Android to always open M3U files with Xiialive (lite), it works fine until I restart my phone. After booting, the default M3U association is taken away from XiiaLive and I once again have to tell Android what program to use when opening that type of file. Do you know what could be causing this problem? It's very frustrating, since I use Tasker to open an streaming M3U in XiiaLive as an alarm clock. but it never turns on if it's stuck on the screen asking what program to open it with.