Name of 1990's PC game? Serious Help needed :)

kiwiirwin

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Apr 19, 2011
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Hello,
I used to play this PC game and I remember the beginning of it. You at a Desk searching for a letter I think and a letter opener then after you find all thats needed in the room you go outside to see a lighthouse. And I remember visiting the mailbox before my next step. Now after that I remember details that are hard to explain if you have any idea please let me know. I think it was a sierra* game.