Actually a game's "Watch Dog's" default resolution isn't supported by my LCD.
How to change its default resolution without opening the game?
My LCD monitor's resolution is 1024x768 60Hz.
Try edit the configuration file located at
%USERPROFILE%\Documents\My Games\Watch_Dogs\<user-id>\GamerProfile.xml (Remember to replace the
<user-id> with your user id. Open it up with any text editor you like (Personally I recommend Notepad++, but notepad is ok.)
After the tag
<RenderProfile, search for something like
ResolutionX="1024" ResolutionY="768". Change the value between the
"" to what you want.
To change the refresh rate, search for something like
RefreshRate="60" and change the value to what you want.