Edit: To get true 16:10 set the FOV Hack to X: 1.2, Y: 1.33 with your desktop and in game resolution being equal, eg 1920x1200 in game, 1920x1200 desktop.
It is both vert- and also stretch depending on the aspect ratio of your desktop vs the aspect ratio of the in game resolution. So annoying.
Feel free to ignore all the stuff below since it is incorrect. Thanks to eZ` for pointing out the error in my methodology in an easy to understand way.
End Edit.
Not wanting to step on anyone's toes, but mikeh and Paddy the Wak both incorrectly claim Far Cry 2 is
vert- in widescreen in this thread: http://www.widescreengamingforum.com/node/9578
Paddy used 1280x1024 which is 5:4, not 4:3. Using the non-4:3 aspect ratio of 1280x1024 has obviously confused all of us. Using 1600x1200 and 1920x1200 I can demonstrate that Far Cry 2 is
stretch, not
vert-.
1600x1200 (4:3)
http://img508.imageshack.us/img508/7872/fc21600gu2.jpg
1920x1200 (16:10) Notice the obvious stretching.
http://img262.imageshack.us/img262/3732/fc21920ej2.jpg
1920x1200 with 1600x1200 overlay
http://img262.imageshack.us/img262/7083/fc2overlayzh1.jpg
1920x1200 w/ FOV hack set to X 1.2, Y 1.6
Hack: http://tocaedit.com/forum/dload.php?action=file&file_id=119
http://img368.imageshack.us/img368/4584/fc21920hacksf6.jpg
1920x1200 hack with 1600x1200 overlay
http://img368.imageshack.us/img368/9379/fc2overlayhackzl7.jpg
One thing to note: Since the FOV hack was built off incorrect assumptions (vert- instead of stretch), when you use "/" to disable it, it actually increases the Y FOV resulting in a rather weird FOV.