When running my program by clicking Run or pressing Ctrl + F5, is it possible to open different windows based on some check condition?

I.e if some condition is satisfied I wish to open a particular window, but if its not I want to open another window.

It should be like before opening any window it should first check for the condition like

if(File.Exists(<path-to-file>)
    Open Window 1
else
    Open Window 2

Is this possible?

c# .net wpf wpf-controls
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