Plenty of graphics formats used ART extension throughout the years and it is likely that at least some of them could be exported as DWG 2D CAD images. This is probably the case for vector-based ART formats, not bitmap graphics though.
Convert Various graphic formats to AutoCAD drawing.
We have found 2 software records in our database eligible for .art to .dwg file format conversion.
Microsoft Windows software - convert art to dwg on Windows
A powerful vector graphics editor from Adobe
Convert from art file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned art to dwg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert art to dwg on OS X
Mac version of Adobe's vector graphics editor