How can I play ALL games at the real resolution of my notebook's
display? It is a wide screen 1280*800 (w*h) display, and in some games
(Quake III, Painkiller, NFS Underground and so on) the standard 4/3
proportions are stretched to fit the full screen. Other games like
Farcry work fine because they use windows' resolution presets, so in
the options I can choose the 1280*800 format, but I want to know how
can I hack or set the display properties in ALL OTHERS games (that
otherwise would stretch the image) to play
at the real resolution of 1280*800, in full screen, without any 
deformation of the image. Thank you.

A lot of current games can be hacked to support widescreen
resolutions. Your first port of call for widescreen hacks should be
the www.widescreengamingforum.com website. If a game can be modded to
support widescreen, it'll be on there.

For Quake III engined games, follow these insructions:

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1 ) Install Q3 based game. 
2 ) Run once, and quit, to generate the .cfg file. 
3 ) Navigate to 'GameDirectory\Base\' directory. (where GameDirectory
is where you installed the game)
4 ) Right click the 'whatever.cfg' file. (for example: jk2config.cfg
in JK2, q3config.cfg in Quake 3, myconfig.cfg in SOF2 etc...)
5 ) Select 'Open With' or 'Open' in the right click menu and then
choose 'Wordpad' in the scroll list. Do NOT choose 'search on the
net'. It's a waste of time.
6 ) You can either have the .cfg files associated with Wordpad or not
from then on.
7 ) Use find (Ctrl-F) to find the string 'seta r_customwidth' and
change the value in the quotes to read either 1680 or 1920, whichever
res you have
8 ) The string 'seta r_customheight' should be below it, if it isn't,
find it, ad change it to whatever value you want. E.g: 1050 or 1200.
9 ) THIS IS VERY IMPORTANT! Change the line 'seta r_mode' to '-1'.
Otherwise it will ignore the settings and do its own thing.
10 ) Find the line 'seta cg_fov' and change the value to '115' or
whatever you want. You can even set it to 360, but it looks like a
fisheye lens. The exact Field of Vision is a matter of taste, so
fiddle and find which setting you like the most!
11 ) Once these changes have been made, save them and start the game.
Do NOT change the resolution in the settings panel, or you will have
to edit the .cfg file again.
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Source: http://www.widescreengamingforum.com/forum/viewtopic.php?t=15
==============================================================================

To enable widescreen support in painkiller try following these basic insructions:

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Go into Bin>config.ini, then find: 

Cfg.Resolution = "1280X720" 
Cfg.FOV = 100 

Change the resolution to what you want and the FOV (field of view)
from 90 to 100-110. The menu and game are now displayed at your custom
resolution.
==============================================================================
Source: http://www.widescreengamingforum.com/forum/viewtopic.php?t=231
==============================================================================

and NFS Underground requires the use of a program hack such as the
UniWS that is downloadable from
http://www.widescreengamingforum.com/downloads.php

If you want to quickly check how to get widescreen support in other
games have a look at the following page:
http://www.widescreengamingforum.com/masterlist.php


I hope this helps!!


Spanky

Fantastic! Thank ou very much, that's exactely what i was looking for.
Have a great 2006!