Why dont people who make xbox games make them forward compatible with the 360? I noticed that it was possible with the burger king games. Why not the others?

They probably included an Xbox and an Xbox 360 version on the same single disc.  It’s not as simple as just adding a couple of extra lines of code.

Its probaly not an easy thing to do.If it was easy you would see people doing it.

But the thing is. Dont you think it should be possible? Not every game is just some huge file. Im pretty sure there are plenty of xbox1 games that could be formatted to be able to play on the 360.

The Xbox uses an Intel processor and an nVIDIA graphics card. The 360, on the other hand, uses an IBM processor and an ATI graphics card. It’s entirely different architecture. It would be rather time-consuming to make a game work on both.