Path Problems

['Terra NovA' B. Loeding]

Ok... Dumb question but...
I install a package and its dependancies.
The executable is in /etc/games/
I type in the filename but get the linux equiv
of a DOS 'bad command or filename'.
I'm puzzled so I copy it to /bin where I type in
the filename again and it runs.

So two questions...
Why isn't the present working directory in the path?
What config file do I edit to place new directories
in the path.

Thanx.