It's not optimised since the graphics engine they use was made in 1998/99, and for Fallout 3 they only hack-patched it to work on NT 6.0 kernel (Vista). later they supplied Obsidian one that was updated for 6.x.
The not optimised only means it uses only one core: the core engine itself, along with the scripting engine cannot even comprehend the fact of more than one CPU core existing, so CPUs with bad one-core performance (most non Core-iX Intels and AMD FX chips under the 8000 line) run it slowly; GPU does not matter for this game since it was designed to run on Voodoo cards originally (something some kids today don't even know what those were).
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yes it works. If I am not mistaken, it is possible you need to download something. I dont remember the name of it. it has Windows in the name. It could be this (Games for Windows Live) http://www.xbox.com/nl-NL/live/pc/downloadclient
Edit: Maybe this helps, I dont know if this is the best solution
http://steamcommunity.com/app/22370/discussions/0/828937546147175081/
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it definitely works for me (windows 8.1)
This worked for me
takes you just a few mins... totally worth it... awesome game
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Yes, it works on Embedded Windows 8.1 industry pro for me. Just to be safe I got a mod off the Nexus, but it Haven't had any problems.
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I am willing to do any simple changes to the game like install the unofficial patch.
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