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Is there any way to set one specific color to be transparent for the whole WPF window?

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You don't need to. Transparency in WPF doesn't work using mask colors like in Winforms- just set the background to Transparent, and AllowsTransparency to true. If you want different shaped windows, you can use the technique described here: http://devintelligence.com/2007/10/shaped-windows-in-wpf/

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We can make a transparent WPF window by using a XAML like follows.

<Window x:Class="SeeThru.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="SeeThru" Height="300" Width="300" WindowStyle="None" AllowsTransparency="True" Background="Transparent"> ...... </Window>
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No. WPF supports alpha-channel transparency, not bitmap mask transparency.

There are people who have attempted to work around this, but only on a per-image basis.

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