What to do if the CAD graphics file is invalid

Solution to invalid cad graphics files: 1. Open [This PC] and click [View]; 2. Uncheck the [Hide extensions for known file types] option; 3. Right-click the invalid file , select attributes, and change the suffix name to dwg.

Solution:

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1. Open "This PC", click "View", select "Options", click "View" and uncheck "Hide extensions for known file types".

2. Find the invalid file, right-click and select "Properties", and change "bak" to "dwg".

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