I will man! I will.

Lizard is right in that some of the newer versions of MSPaint can screw with the specialized palleting system in Cortex Command (limited to 256 colors).

I'm not sure about Window 7 or 8's compatibility, but I attached the Windows XP version of MSPaint to facilitate testing things out.

It's best to copy an existing file and edit it to create a new sprite.

I never had to use anything more advanced to MSPaint in any of my mods, but you'll have to take that for what it's worth

You know the first think u see about me is my age then u think I'm retardet as ♥♥♥♥ well I'm not because I can do most of the stuff u do but I do it in a harder way I wasent even trying to argue I was just suggesting that he (try's) mspaint he doesn't haft to keep like it nor use it .

I use XP MSPaint, it's got the features I need and none that I don't need.
While onionskinning and layers and stuff like that is convenient for spriting in general I don't really need those for CC spriting, and what little animation I do I can do well enough by eye.