Files with DWG extension represent proprietary binary files used for containing 2D and 3D design data. Like DXF, which are ASCII files, DWG represents the binary file format for CAD (Computer Aided Design) drawings. It contains a vector image and metadata for the representation of the contents of CAD files.
A file with .wmz extension is an intermediate level file generated by older versions of Microsoft Office applications. It can contain embedded equations, clip art, or other vector graphics.
You can also convert DWG into many other file formats. Please see the complete list below.