Introduction - If you have any usage issues, please Google them yourself
The DWGdirect DRX SDK is a package that allows users to create extensions for DWGdirect-based applications. DRX applications can access the data in a DWG/DXF drawing file, add custom commands to the global DWGdirect command stack, and create custom objects and entities.
The SDK can be used to create DRX modules only, not stand-alone applications. DRX modules are Microsoft® Windows® DLLs which can be loaded at runtime by a compatible DWGdirect application.