NDS rom files

I have yet another problem. I recently downloaded NDSheader(it lets you extract files from the rom) And I managed to extract Kirby Super Star Ultra. Here's the thing though, I'll give you some examples. There's .SRL files, There's .VX files, there's .SDAT files, and I don't know how to open them, I don't know of a program that can. Please Help!!!!
Nathanael