During this month Microsoft will be making 19 more original Xbox titles backward compatible on the current xbox one generation of consoles. All of these Original Xbox games will take advantage of the power of Xbox One with up to 4X the pixel count on Xbox One and Xbox One S, and up to 16X the pixel count on Xbox One X.

The first batch drops on April 17 and will include

Blinx: The Time Sweeper
Breakdown
Conker: Live & Reloaded
The Elder Scrolls III: Morrowind
Hunter: The Reckoning
Jade Empire
Panzer Dragoon Orta
SSX 3

The 2nd batch drops on 26th of April includes

Destroy All Humans!
Full Spectrum Warrior
Mercenaries: Playground of Destruction
MX Unleashed
Panzer Elite Action: Fields of Glory
Star Wars Battlefront
Star Wars Battlefront II
Star Wars Jedi Knight: Jedi Academy
Star Wars Jedi Starfighter
Star Wars Knights of the Old Republic II: The Sith Lords
Star Wars Republic Commando

IF you own the original discs all you do is pop the disc into the Xbox One, and you will be able to play it without paying for it again (im looking at you SONY) if you dont own an original disc digital versions can be acquired from the Microsoft Store.

visit https://majornelson.com/blog/xbox-one-backward-compatibility/ for the full list of backward compatible titles available on Xbox One.