Wine allows users to run Windows programs natively under Linux without paying a dime. However, there's a tiny problem: programs running in Wine don't look so great. They don't even try to fit into your native GNOME or KDE color scheme or use your preferred fonts. You could use a Windows theme, but themes make Wine run extremely slowly. Luckily, with a little configuration editing, it's easy to make Wine applications look at lot more like the rest of the apps on your desktop.
To integrate Wine applications with a GNOME desktop, first run the winecfg utility and switch to the Desktop Integration tab.