It is a little complicated, but it is possible.
VS checks if the file added to the resource has already been defined somewhere in your project. If he cannot find it, he creates the “Resources” folder, places a copy of the file there, adds this file to the project and places a link in the resource constructor to this fresh copy of your file.
To avoid this behavior, you must add the file to your project before adding it to the resource file. If the file is not in the structure of your project, you can simply create a folder, right-click on it, select "Add File" and, before clicking the "Add" button in OpenFileDialog, click on the small arrow next to the button and select "Add as". link.
Now the file is located in the same place on your hard drive where you want, and the resource designer does not create a copy in the project file if you now add the file to the resource designer.
Maybe this small picture helps you find the Add button as a link: 
(source: modbusdriver.com )
Oliver
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