NtsPad32.exe, the installation program, will copy the following files into the installation directory that you specify (default is C:\Program Files\Notespad):
Free *.dct dictionary files are available from www.BremerCorp.com.
More *.npc text clip files are also available from www.BremerCorp.com.
Setup will also make a Start Menu Programs group called Notespad.
It's ok to install a new version of Notespad over an older version as long as you install it to the same folder, otherwise you should uninstall the previous version first.
*** Uninstall
If you wish to uninstall Notespad, you should do so from the Control Panel's Add/Remove Programs applet.