Saving Custom Paint Colors

How do you save a custom color, I make the color OK but when I close paint and reopen its gone?.
Thank You

Maybe this can't be done, does anybody know where the file for default colors is stored. Maybe I could
modify one.
Z

I tried to do it and they always seemed to disappear. I did not, however, save a file where the custom color was used. I would assume, it would be saved with that file.

If you can't do anything else, write down the numbers for your color so you can get it back quickly.