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CAD tip # 5102:

Question CAD
% platform category

	Drawing file is not valid (error).
	The error message "Drawing file is not valid" when opening a DWG file informs about a corrupted drawing file or a DWG format of a newer AutoCAD version. Try to open the .DWG file in Notepad and check if the file starts with AC10xx (see Tip 868). You may try to use the `RECOVER` command on the file, or `INSERT` it into an empty drawing.

ACADLT

* CAD

8.7.2006 123461×

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AutoCAD LT

applies to: AutoCAD · AutoCAD LT ·

See also:
Tip 4505:	Backward compatibility of the AutoCAD DWG formats.
Tip 868:	How to find drawings coming from a given version of AutoCAD?

Selected tip: A closed polyline cannot be extruded.

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CAD tip # 5102:

Drawing file is not valid (error).