NTCompress

NTCompress is a Nintendo Wii SDK Tool that is illegal to distribute or possess without some kind of license from Nintendo. No links will be provided for it here.

Usage
It can be used to compress files with the LH format, known for being used in versions of NewerSMBW prior to version 1.30. There is also a decompressor tool, however it's also illegal to possess or distribute to others.