What is the IPJ file format?
An .ipj file is an Autodesk Inventor Project file - a small XML configuration document that defines the workspace for an Inventor design. It is not a 3D model; it tells Inventor where to search for part files (.ipt), assemblies (.iam), libraries, Content Center data, and design data when resolving cross-file references.
Each Inventor project has exactly one .ipj, typically stored alongside the top-level assembly or in a dedicated project folder. The file must be activated through Inventor's Projects dialog before the design can be opened correctly - double-clicking the .ipj launches Inventor and sets the active project automatically. Key elements in the XML structure include <WorkspaceFolder>, <LibraryPaths>, <ContentCenterPaths>, and optional Autodesk Vault integration settings.
Because .ipj is plain UTF-8 XML, it can be opened in any text editor, which is useful for adjusting paths in batch migrations or deployments. Hand-editing without Inventor's validation can, however, break file resolution across large assemblies.
The format has been stable since Inventor 6 and remains compatible through Inventor 2026. Related design files include .dwg drawings and .iam assembly files.
Security & safety
RISK: LOWPlain XML text file; no executable code. No known security risk. Could contain network path information (internal server names) if shared externally.
Format details
in a nutshellPrograms that open IPJ files
Windows2 apps
Autodesk Inventor
Paid Launch Inventor → File → Manage → Projects → click 'Browse' to locate the .ipj → click 'Done' to activate it, then open the assembly. 
Any text editor (Notepad, VS Code, Notepad++)
Free Open as plain text to inspect or edit XML path definitions. Save as UTF-8 without BOM. Technical details
deep spec| Format | XML (plain text) |
| Encoding | UTF-8 (UTF-16 in some older Inventor versions) |
| Typical size | 2 KB - 20 KB |
| Root XML element | <IProperties> or <VaultOptions> |
| Key XML nodes | <WorkspaceFolder>, <LibraryPaths>, <ContentCenterPaths>, <DesignDataPaths> |
| Associated OS | Windows only |
| Activation method | Must be activated via Inventor's Projects dialog before opening designs |
| Vault integration | Optional Autodesk Vault path and settings embedded in XML |
| Version compatibility | Stable since Inventor 6; compatible through Inventor 2026 |
| Related file types | .iam (assembly), .ipt (part), .idw (drawing), .ipn (presentation) |
| Released | ~2000 (Autodesk Inventor series; exact version unknown) |
| Latest version | Compatible with Inventor 2026 (no version field in file; format stable since Inventor 6) |
| Specification | help.autodesk.com |
IPJ conversions
Community Q&A
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