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var
FS: TFileStream;
Value: Byte;
begin
FS := TFileStream.Create('test.exe', fmOpenReadWrite);
FS.Position := 100;
FS.ReadBuffer(Value, SizeOf(Value));
if Value = 0 then
begin
FS.Position := 100;
Value := 1;
FS.WriteBuffer(Value, SizeOf(Value));
end;
FS.Free;
end;