Originally posted by leod
I'll bring up Split 32X with asm mods cause I don't know what it was for and what the patch changed to make it obsolete but they probably do.
the old version of the 32x32 patch had 2 files named leftgfx.bin and rightgfx.bin
they were both the same size and format as the regular gfx32.bin, except one contained the left half of the player tilemap and the other the right half. working with mario's gfx is annoying enough as-is, so imagine having to go back and forth between 2 files. so kipernal's tool would merge leftgfx.bin and rightgfx.bin temporarily to allow for easier editing of the player gfx
the 32x32 patch was eventually updated so that there would only be 1 player gfx file. additionally, this file is organized in a way that makes it very simple to edit the player gfx. so tool became obsolete
the only reason to keep it is if someone is still using the old version of the patch (which is not recommended) or if i/someone ever decide to revert the patch back to the old format (which is not a good idea)