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What is an IDW file?

IDW stands for Inventor Drawing. In an IDW file, users place views of an Inventor model on one or more drawing sheets, then add dimensions, tolerances, notes and other annotations to document the design for manufacturing. Assembly drawings can also include an automatically generated parts list and item balloons.

An IDW file does not contain the 3D model itself. Its views are linked to the .ipt part and .iam assembly files they represent, so the drawing updates when the model changes. The format is proprietary and is intended to be opened in Inventor or Autodesk viewing tools.


IDW vs. DWG drawings in Inventor

FeatureInventor IDW (.idw)Inventor DWG (.dwg)
Drawing contentViews, dimensions, annotations, parts listsSame content, identical drawings
Openable outside InventorLimited to Inventor and Autodesk viewersCan be opened by AutoCAD and many DWG-compatible tools
Default in recent Inventor versionsNoYes
Typical useLegacy Inventor projects and existing templatesSharing drawings with AutoCAD users and partners

What Is IDW Used For? Applications and Industry Use Cases

IDW files hold the manufacturing drawings of products designed in Autodesk Inventor: machines, equipment, tooling and fabricated parts. Many companies still keep large archives of IDW drawings from older Inventor projects, even if new drawings are now created as DWG files.

For software developers, Inventor drawings are usually reached through the formats around them. The 3D content comes from the .ipt and .iam files referenced by the drawing, while 2D drawings shared outside Inventor are typically exchanged as DWG, DXF or PDF.


Challenges or Common Pitfalls

Because IDW is a closed format, few applications outside the Autodesk ecosystem can open it directly. Companies that need to share Inventor drawings with suppliers or other systems generally save or export them to DWG or PDF first.

Drawings also depend on their source models. If the referenced parts and assemblies are missing or out of date, views cannot be regenerated correctly. And since 2D drawings and 3D models are separate files, keeping them consistent across revisions is a recurring concern in drawing-based workflows.


How Spatial Helps

Our 3D InterOp SDK focuses on the data behind Inventor drawings. It reads Autodesk Inventor parts (.ipt) and assemblies (.iam), and delivers exact B-rep geometry, product structure and metadata to CGM Modeler, 3D ACIS Modeler or Parasolid.

For 2D drawings, 3D InterOp reads DXF and DWG files and can write drawing sheets to DXF and DWG, converting curves, point sets and notes into paper space entities. This gives applications a practical route for drawings that Inventor users save as DWG.

3D InterOp does not currently document direct reading or writing of the IDW format itself. Check the 3D InterOp Format and Version Support page for the latest list of supported drawing formats.

Dassault Systèmes

Siemens

Autodesk

Standards

Other

  • Pro/E / Creo
  • Rhino
  • MicroStation DGN
  • AVEVA
  • Smart3D

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