I need answers about some stuff

Ok first off, i like modding and i need some help with it. When i finish editing the files and try to inject the file back into rez file it says this;
"Problems loading rez file" and it closes. Anyone know how to fix that?

And second, I dont know what PS is best for modding but if anyone knows could you just PM me or post which one is best. You could include a link too but if you cant ill just go google and look for it.

Oh, and mods/minions if this is wrong section can you move it?

This should probably go in the help or modding section, but I'll try to help you out.

Before injecting did you remember to convert the dtx back over to nexon format?

And, my personal favorite photoshop for all round editing is CS4.