Battlefield Vietnam

Navigate to \EA Games\Battlefield Vietnam\Mods\Bfvietnam\Settings\ and look for the files "video.con, videoDefault.con, videoCustom.con". Open them and change any resolution to your desired resolution. Some files may point to another path, such as Profiles/Custom/. Follow this path to the right file and edit "renderer.fieldOfView 1". Use 1.15 for a 16:10 aspect ratio or 1.25 for a 16:9 aspect ratio.

The intro video and menu will always display in a set resolution, but once in game, the full resolution will be displayed.

The 2D overlay stuff like the map and the text look stretched, but the in game 3D character models and environments look normal.

This did not appear to work for multimonitor. The correct FOV figure of 2.67 produced significant distortion. Even using a figure as low as 1.4 caused significant distortion on that resolution, plus the HUD stretch makes it unplayable.

This site provides more information on tweaks: http://www.tweakguides.com/BFV_6.html
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For anyone interested, I was able to squeeze an extra 16 FPS (from 31 to 47) by adding the following to my videoDefault.con file:
Code:
renderer.fieldOfView 1
renderer.use.TrilinearFiltering 0
renderer.globalLodRadiusScaleFactor 6

So now my videoDefault.con looks like this:
Code:
rem * TEMP *
renderer.FullScreen 1
console.showStats 1
renderer.allowAllRefreshRates 1
renderer.fieldOfView 1
renderer.use.TrilinearFiltering 0
renderer.globalLodRadiusScaleFactor 6

This might be old hat, but I also found http://www.planetbattlefield.com to be a decent reference for some of these elements explained...