Full Idea
On my view, actual acquaintance is not necessary to open a mental file; expected acquaintance will suffice; yet opening a mental file itself is not sufficient to entertain a singular thought-content. It only enables a thought-vehicle.
Gist of Idea
Expected acquaintance can create a thought-vehicle file, but without singular content
Source
François Recanati (Mental Files [2012], 13.1)
Book Reference
Recanati,François: 'Mental Files' [OUP 2012], p.164
A Reaction
I'm not clear why I can't create a file with no expectation at all of acquaintance, as in a fictional case. Depends what 'acquaintance' means. Recanati longs for precise distinctions where they may not be available.