.IPJ file extension

This is the basic program to work with .IPJ extension

Autodesk Inventor

Autodesk Inventor Autodesk Inventor (tm) Project Document

Autodesk Inventor is a program that offers an easy-to-use set of tools for 3D mechanical design, documentation and product simulation. You can control and manage assembly design data, combine Inventor and Alias for plastic part design, accelerate design of tubes, pipes and hoses, change the 3D sketch of part and menu ribbon... (more)

The program works with the following extensions: iam, ide, idw, ipj, ipn and ipt

.IPJ extension is also supported by the following programs:

Autodesk Inventor Professional

Autodesk Inventor Professional Autodesk InventorĀ® Project Document

Create or modify original 2D or 3D mechanical designs.
Autodesk Design Tracking

Autodesk Design Tracking Autodesk Inventor (tm) Project Document

It ixes that are in Autodesk Inventor Release 3 Service Pack 1.