M3-GBC Emulator!

I was curious about emulators, so I decided to download the SNES emulator, and that worked out fine, but the GBC emulator (DSBOY) is a different story. I just can't seem to find what kind of files run on the thing. When I run the .NDS it takes me to a file select screen, which is okay, but I don't know what kind of files the DS emulator runs. Also, is there a certain directory I should reserve for the emulator? The files I got from my download and where they are located are:
_system_/test.ds.gbc
G:(Flash Card)Test.nds
This seems rather straight forward, but it's giving me a hard time. Could someone help?
Thank you!

I don't have any experience with DSBOY, I use lameboy.Leave the emulator in the root file and make a folder in the root called "GB" or "Gameboy" or whateverYou should be able to open the roms from there.You've probably already DLDI patched, so I don't have to go through that.