Dozens of different EXP formats exists, but only some of them are used for graphics or CAD purposes. These types of .exp files can be exported to DWG format with a proper tool, provided they contain shapes or vectors that can be translated this one.
One of the most sought after exp to dwg conversion is export of CATIA files (.exp), simply because this format is rarely supported in standard CAD software. And if you do not have access to CATIA, your only option is to rely on one of the dedicated 3D model / CAD converters.
Updated: October 31, 2023