[Dev-C++] Installing new package

[Hadi A. <ha...@te...>]

Hello all,
I just download and try Dev-C++ 4.0 in my PC (Win 98SE).
Then I read in FAQ about adding new package(s) in Dev-C++, so I go to
http://www.bloodshed.net/dev/packages/index.html
Here, I download fltk library, then as the website said :
"...To install them, simply doubleclick on them. "
And I do what it said, but it seems there's no program associated with
.DevPak file(s).
So, I can't install this package. Then I searched the archive file(s), with
the hope to found this problem and the solution, but again I am not lucky
enough to found out about this.
So, please tell me what should I do to install this package ?

Thanks,
Hadi