I noticed over at the Widescreen gaming website, that both Descent 1 & 2 are listed as capable of running in widescreen resolutions
http://www.widescreengamingforum.com/wiki/index.php/Master_Games_List_-_D
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D3 however, isn't listed among the games that support widescreen resolutions. Will D3 support any widescreen resolutions?

Look at my post on the same topic.
The short answer: sort of. It's pretty annoying, but it's definitely playable.
Here's a link to the post:
http://www.gog.com/en/forum/descent_series/descent_3_display_problem

I did some digging and found this here at gog under the support listing for Descent 3 as well as on a few other websites.
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"select Setup from the launcher window.
Now click the last tab ("Misc"). You must input the command line parameters in the "Optional D3 Command-line Switches" field. You need to know the vertical and horizontal resolution you want to use and its aspect ratio (width/height, if different than 1.33) and use the following parameters:
-width X -height Y -aspect X/Y""
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This is what I'll have to do as my gaming PC is only hooked up to an older HDTV. In my case my settings will be "-width 1136 -Height 664 -aspect 1.71" as I have to run an overscan compensated 720p (1280x720)
Were you still encountering your problem in the post you linked after you entered the above command line options?

Hi,
I found this regarding Descent 3 and Widescreen.
Don't know if it's any help, but i figured it couldn't hurt :)
Good luck.

Yeah I tried that. Actually, it didn't make a lick of difference. What worked was going to options while in-game, choosing a resolution that worked, and then hitting TAB (strange, I know) to confirm the choice.
But it still didn't fix anything except for the actual in-game screen itself. For instance, changing control configurations is obnoxious when you can't see some of the screen.
Good luck, though, because from playing this years ago I know it's a great game!

I have "-width 1280 -height 800 -aspect 1.6" and it works. I tried a few things and it didn't work, but this is good. I know if there's an invalid value it kicks you back down to 800x600 (I think)
One thing that I have never been able to do is keep the graphics in 32-bit. I always have to hit F2 whenever the game starts.

I bought the game and used the command line switches I mentioned in my other post:
-width 1136 -height 664 -apsect 1.71
and it works. The only exceptions are the 32/16 bit color bug that Box OfSnoo mentioned and the draw rendering distance setting, which I've maxed, also doesn't seem to hold. Otherwise the game looks and plays very well. ;)