Disabled Icons?

To make disabled icons, do you only have to add DIS (or whatever it is, don't remember right now) before the filename, could I use this for my icons that use their own path, ie not replacing ordinary icons, or do you have to replace the normal ones?

To make an icon disabled, put the enabled icon in the path ReplaceableTextures\CommandButtons\BTNIconName.blp and the disabled icon ReplaceableTextures\CommandButtonsDisabled\DISBTNIconName.blp.