How to log in to an existing Guild Wars 2 Account via Steam
 

Adding the Launch Argument

After installation, click "Properties", to open the configuration menu.
 
 

 
 
In the "Launch Options” box add the following text.
 
 

-provider Portal

 
 
 

 
 
This will load the Steam Launcher instead of the standard launcher and allow you sign in with your existing account information.

 
 
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