What happens when you step through the code? where do you get the error? Is it when it does the Stream:=tfilestream.Create(mapfile, fmopenread);
or on one of the stream.ReadBuffer(C, SizeOf(C)); statements?
If it is on the file open, then there's a problem with the file location/filename and the app can't find it.
If it's on one of the ReadBuffers then the file isn't big enough for the array..
I'm not at a Delphi PC at the moment, so I can't test anything.
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