Change icon runtime not show in determinate folder

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C#

WPF

I changed the Icon in main windows where valor is type of system, like this:

if (valor == 4)
	this.Icon = BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-vs.ico", UriKind.RelativeOrAbsolute));
else if (valor == 6)
	this.Icon = BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-v.ico", UriKind.RelativeOrAbsolute));
else if (valor == 7)
	this.Icon =  BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-s.ico", UriKind.RelativeOrAbsolute));

But when I install this path

C:\DC_System\Vendas

the Icon just task bar not show. The interesting is that if i change the name of executable, the icon show. How can I resolve this?

What I have tried:

if (valor == 4)
	this.Icon = BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-vs.ico", UriKind.RelativeOrAbsolute));
else if (valor == 6)
	this.Icon = BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-v.ico", UriKind.RelativeOrAbsolute));
else if (valor == 7)
	this.Icon =  BitmapFrame.Create(new Uri("pack://application:,,,/Vendas;component/Imagens/icone-s.ico", UriKind.RelativeOrAbsolute));