Notice that this is for loz-spirit tracks. I'll try to list the steps in order for you to apply the patch.
1."zelda.bin" is supposed to be the game file (should be in .nds format) that you're supposed to have in order to do this patch. For this step google is your friend
. For now lets call this file game.nds.
2. place the file in the extracted patch folder.
3. run cmd.exe and locate the folder.
4. type xdelta.exe -d -s game.nds zelda_spirit_tracks_dpad.xdelta
5. ??? profit
6. your new file should be called zelda_spirit_tracks_dpad.nds
I hope this helps