http://omploader.org/vNThxNg/seatab_tdm.zip
These tools are not protected against 'dumb' usage, and will probably crash in such situations.
Unpack the ROM using ndstool or such to get access to list.bin&DATA.000.
Click+drag list.bin onto seatab.TDM.Unpack.exe to unpack to that directory (into a subdirectory named archive_data). Or if you're smart enough you can give the arguments yourself, it's a console tool.
Inside this directory there will be more subdirectories of game files, and an archive.xml. The archive.xml is generated by my tool to preserve some information about the original archive (file ordering basically, necessary to regenerate correctly).
Edit files to your hearts content, then click+drag archive.xml onto seatab.TDM.Pack.exe and it will repack files into a list.bin&DATA.000 pair in that directory. Another console tool.
.bin = Raw binary data of various formats.
.swg = UI layout&scripting. Some 'SWF-like' format. I bet it's some variant of the
Scaleform GFx formats.
.ntf = Texture data.
.snd = Sound data.
There are some other file types too other than what I've mentioned.