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My system had some lagging/hang issues just now while working on a drawing, and as a result I now get the message Drawing file is not valid when trying to open it. What to do?!?
If at first you don't succeed - remove all evidence you ever tried.



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open auotcad first, than use recover under file drop down menu to open your file. It may work.
Also you can rename the last .bak file as .dwg & open it than save it as your drawing.
"An architect's most useful tools are an eraser at the drawing board & a wrecking bar at the site."
Frank Lloyd Wright
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