Is it possible to run windows' programs in Linux?(Even by hacking or editing linux's source code or so)

You can use wine, as other people have indicated.

There are also some commercial products - Crossover Office (link below) is runs browser plugins and some Microsoft Office products.

For games, Cedega (link below) runs some of the most common Windows games on Linux. I use it to play World of Warcraft on Linux and it works quite well.

You can run windows' programs using wine.
It has a fully-functional support for some popular
program such as photoshop, office, dreamweaver.
For other programs, it might also run properly.

Yes, there's a program called "Wine" that will run Windows applications.

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hmm i havent heard of this but anything is possible with computers these days