Documentation
I have written a handbook which describes in detail how mtPaint works. The Windows setup program installs this handbook.
There are also these packages:
mtpaint_handbook-?.??-noarch-?.tgz - Package for Slackware compatible systems.
mtpaint_handbook-?.??.tar.bz2 - Archive for GNU/Linux systems.
You are can download these files HERE
You can browse these documents online HERE