There is no default shortcut for this, but you can add it yourself:
- Click "Tools" → "Options"
- Select "Keyboard" in the list on the left.
- At the show commands, type:
Project.AddReference - Select the add link command, click the "Press Shortcut Keys" button, and select your own shortcut.
I would suggest something like CTRL + ALT + SHIFT + R , because the CAS combo has very few overlaps.
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