This is a syntax file for Cube cfg files. It applies to autoexec.cfg, package.cfg and any other file which uses Cube script.

Features:

• Support for keyboard keys names only after "bind" command. (MOUSE1, MOUSE2,... is also supported)
• Support for entities names only after "newent" and "clearents" commands.
• Support for all cube commands of version 2004_05_22, except "keymap" (which you should not use, according to docs).
• Recognizes special aliases "level_trigger_xx" and "nextmap_xx".

Install details:

Put the file on ~/.vim/syntax/ directory. Then, when opening some Cube cfg file, type:
:set syntax=cube

You can/should also put this line at top or bottom of your Cube cfg file:
// vim: set syntax=cube
This will make vim automatically apply the Cube syntax.

See also:
Vim official site
This script at vim official site