just make it look more like Windows version?
Because it's a completely different OS with completely different guidelines and toolkits for building GUI applications.
I find it great that it still works and that they continue to provide updates for it every now and then, which is amazing given the amount of will these large companies have to support Linux (Adobe for example removed support for Air and Flash years ago, and recently even Acrobat Reader). That it looks odd can only be contributed to their choice of libraries, which is Qt over GTK.