The major enhancements to the SolidWorks API 2010 are as follows. Select Help > API Help > SolidWorks API Help > SolidWorks API > Release Notes in an active session of the SolidWorks software for details about these enhancements and links to the relevant Help topics.

• Create constraint-based reference planes.
• Access DimXpert features.
• Include attributes in library features.
• Get the type and name of an interactively selected feature in the model document.
• Access tangent lines associated with bend lines in drawings of sheet metal parts. 
• Get an array of mates for a component.  
• Specify alignment of axes when inserting a coordinate systems mate.
• Find the corresponding faces, edges, and vertices in a folded and flattened sheet metal part.
• Fire notifications:
  • Before and after undo and redo operations in parts, assemblies, and drawings.
  • When interactive users preselect entities in parts, assemblies, and drawings.
  • After all SolidWorks graphics are drawn.
  • After rebuilding or rolling back an assembly document.
  • After selecting components for Quick View/Selective Open.
  • When third-party applications automatically save documents to IStorage.
  • When starting or stopping the dragging of an Instant3D manipulator in assemblies or parts.
• Compare two persistent reference IDs to determine if they point to the same SolidWorks data.
• Create bubble ToolTips for PropertyManager page controls.
• Add and modify graphics-area dimensions in circular and linear sketch patterns.
• Add components according to specific configuration options to assembly documents. 
• Copy components with mates to an assembly document. 
• Get and set pick points for lofts.
• Add and purge display states and fire notifications when a display state changes.
• Create equations for 2D explicit, 2D parametric, and 3D curves.
• Delay solving equations until all equations have been added.
• Get or set a component reference.
• Box-select entities.
• Include specifying the distance from the section line from the section view.
• Determine if a sketch is derived.
• Insert a route line in an explode line or 3D sketch.
• Rotate or copy 3D sketch entities about a vector or x, y, and z coordinates.
• Add smart components, insert virtual components, and insert virtual assemblies in assemblies.
• Create a new assembly from preselected components and save it to an external file.
• Insert a title block table in a part or assembly.
• Get sheet and configuration persistent reference IDs.
• Create a loft body using specified parameters instead of using interactive-user selections.
• Hide table columns.
• Rename tags in hole tables.
• Get the UV parameters of a curve or face.
• Access feature statistics. 
• Insert weldment features without preselecting faces and bodies. 
• Insert sheet metal base flanges in a multi-body sheet metal part.
• Insert mate references that align with the axes of the coordinate system or origin. 
• Get a component in the context of the top assembly after getting the component in the context of a subassembly, and get a component in the context of a subassembly after getting the component in the context of the top assembly. 
• Handle focus events for PropertyManager page controls (combo box, edit box, list box, and number box).
• Use PNG images as PropertyManager bitmap buttons.
• Open advanced dialogs when opening documents.
• Export parts to DXF/DWG files. 
• Save a part or assembly as a de-featured part. 
• Get last save error issued by Microsoft.
• Project and display dimensions along x, y, and z axes for selected points in a 3D sketch. 
• Rotate and translate Move Face features.
• Get solid-fill hatch information in detail, broken, and crop views.
• Get sketch pictures imported into a view when a drawing is created from a part.
• Customize the sizes of balloons.
• Hide a BOM table when inserting it in a part, assembly, or drawing.
• Get the transform of an instance of a pattern or mirror solid feature.
• Set and remove textures by display states on bodies, faces, and features.
• Okay and close a PropertyManager page, or move to the next selection box, after making a selection in a PropertyManager page.
• Get or set focus on a control on a PropertyManager page.
• Get or set which bodies of a multibody part to show in a drawing view.
• Create user-defined popup menus and context-sensitive menu icons for C++ applications only.
• Create multiple types of macros (VBA, VB.NET, and C#) when recording a macro.