CFG file

A CFG file is a file used to determine certain properties of sprites upon insertion via Sprite Tool. The file either points to an ASM file to use as the sprite's code, or provides the number of an original Super Mario World sprite whose properties are to be tweaked. It also provides the values for configurable settings that the sprite will load into RAM upon spawning. Note that most custom sprites do not make use of the vast majority of the options here.

The name of a section ("Sprite Tool Info", "Option", and "Extra Info" are exceptions to this) is the RAM address the values are loaded into when the sprite spawns.

Sprite Tool Info

   Tweak/Custom Acts Like - This is the sprite number of either an original sprite which will be tweaked or the number of an original sprite from which a custom sprite will draw its default properties. In custom sprites, this value is often set to a sprite that was unused in the original game, such as 36.
   ASM file - This is the ASM file to be used as the code for a custom sprite. 

1656

   Object clipping, table offset (0-F) - The object clipping value for the sprite
   Can be jumped on - Whether or not the sprite is safe to be jumped on by Mario
   Dies when jumped on - Whether or not being jumped on kills the sprite
   Hop in/kick shells - Determines if the sprite will interact with a shell like a Shell-less Koopa does
   Disappear in a cloud of smoke 

1662

   Sprite clipping, table offset (0-3F) - The sprite clipping value for the sprite
   Use shell as death frame
   Fall straight down when killed 

166E

   Use second graphics page - If checked, the sprite will load its graphics from SP3/SP4 instead of SP1/SP2
   Palette - The palette the sprite will use
   Disable fireball killing - If checked, the sprite will be immune to fireballs
   Disable cape killing - If checked, the sprite will be immune to cape swings
   Disable water splash - If checked, the sprite will not generate a splash effect when entering water when sprite buoyancy is enabled
   Don't interact with Layer 2 objects - If checked, the sprite will not interact with objects on Layer 2 

167A

   Don't disable clipping when killed with star - Normally, when killed with a star, a sprite stops interacting with objects/sprites. Check this box to disable that effect
   Invincible to star/cape/fire/bouncing bricks
   Process when off screen - If checked, the sprite's code will run even when the sprite is not on-screen
   Don't change into a shell when stunned - The default behavior for a sprite is that when it is in its stunned state, it is a Koopa shell (like when a Koopa comes out of a ? Block or Turn Block). check this box to disable that behavior
   Can't be kicked like a shell
   Process interaction with Mario every frame
   Gives power-up when eaten by Yoshi - When Yoshi eats certain sprites, such as Mushrooms, Fire Flowers, and Cape Feathers, the power-up is given to the player. Check this box to enable such behavior
   Don't use default interaction with Mario - Disables default interaction with Mario (default interaction being that it hurts Mario when touched from the sides, is damaged when jumped on, etc.) 

1686

   Inedible - Disables being able to be eaten by Yoshi
   Stay in Yoshi's mouth - Makes it so Yoshi will not swallow the sprite upon eating it (such as with Koopa Shells and carryable items)
   Weird ground behavior
   Don't interact with other sprites - Disables interaction with other sprites
   Don't change direction if touched - Disables turning around when touched
   Don't turn into coin when goal passed - Disables the sprite becoming a coin if it is on-screen when Mario crosses the Goal Tape
   Spawns a new sprite
   Don't interact with objects - Disables interaction with objects 

190F

   Make platform passable from below
   Don't erase when goal passed
   Can't be killed by sliding - Disables being able to be killed by sliding
   Takes 5 fireballs to kill - Makes killing by fireballs take five fireballs instead of one (as seen in the Chargin' Chuck)
   Can be jumped on with upward Y speed
   Death frame 2 tiles high
   Don't turn into a coin with silver POW - Disables being turned into a Silver coin when the Silver P-Switch is activated
   Don't get stuck in walls (carryable sprites) 

Option

   Use xkas for assembly - If this option is checked, the sprite will be assembled with xkas instead of TRASM 

Extra Info

   Extra Property Byte 1 - A general-purpose value that can be used for anything. Use is usually specified in the sprite's code, if it is used at all.
   Extra Property Byte 2 - A general-purpose value that can be used for anything. Use is usually specified in the sprite's code, if it is used at all.