I'd also like to know... It's a very good realistic adventure game. My disk is scratched, making it unreadable...
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I have found the game here. https://archive.org/download/who-is-oscar-lake-eng-win3x-v1_32
But haven't managed to get it to work... first it gives a quicktime error, then (after copying some quicktime files from an old version I found on the web) it gives a "not a valid movie error