Emulation.

Or as the wine blarb goes "Wine Is Not (an) Emulator". Which is certainly true of both the Wine project and the Qemu project. Both can use full blown MS Windows installs and that is where the problem lays. As GNU/Linux adoption via a collection of a kernel and several applications commonly known as distributions continues almost unabated we have wine and Qemu which in my honest opinion are fighting the good fight and slowing down Linux adoption in several areas. How and why are wine and Qemu slowing down Linux adoption? Well, the answer to both questions are basically the same. Because people who install a distribution then go on to install wine and/or qemu and then go on to install MS Windows within one or both of those and then go on to install whatever MS Windows application they see as being unavailable under their choice of Linux based distribution are simply stopping the improvement of applications in the same field from growing as the good folks who create these programs don't see the need to create further as people who use wine and qemu are settled on whatever application they used under the MS Windows operating system. And that is the why and how answered. If only these people who dogmatically insist on using applications designed for another operating system on their distribution of choice used whatever search engine they prefer, or look at web sites like this one which shows The table of equivalents / replacements / analogs of Windows software in Linux they would see that in almost every single case there is an equivalent application that runs natively under a Linux based operating system. They could then remove the baggage known as wine and qemu and quite possibly at the same time have a more stable system.