The listing, Star Trek Deep Space 9: The Fallen (PC game) has ended.
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From the Wikipedia Arrticle:
"The story focuses primarily on the efforts of Starfleet to acquire the three orbs of the Pah-wraiths, which could potentially be used as powerful weapons of apocalyptic scale. In doing so, they are competing against the Cult of the Pah-wraiths, Prophet-following fanatics, a rogue Cardassian anti-Dominion group, and the Dominion itself.
The game can be played from the perspectives of Sisko, Kira or Worf."
This is a 'third-person shooter' that runs on the 'Unreal Engine'. It was released in 2000 so as far as system requirements you're probably looking at Windows 98 and above.