is it normally by opening a new drawing from autocad 2010 in form of a *.dwt- file, that in every drawing is an block on first position:
AEC? Isn't that architectural? If you are in the correct forum (autocad and not architectural), the answer is: No, that is not "normal".
If, on the other hand, you ARE using autocad, then start a New dwg (dwt), make any changes you want to it and save as acad.dwt in the Template folder.
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