Well, it makes a lot of sense. For example, as a Konqueror user I often encounter web sites saying "Your webbrowser is not supported". Luckily the Konqueror developers built in an option to make Konq lie about its identity. More often than not, after making Konq identify itself as IE6.0, the website works perfectly.
I think the Wine developers want to avoid this trap: They don't want people to add messages "Sorry, you cannot run this program, use a real Windows instead".
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