Opening an OBJ file in Autodesk Inventor can be a useful process when you want to incorporate 3D models created in other software into your designs. Here's how you can do it:

1. Launch Autodesk Inventor: Start by opening Autodesk Inventor on your computer. If you don't have it installed, you can download and install it from the official website.

2. Create a New Assembly: Once Autodesk Inventor is open, create a new assembly where you want to import the OBJ file. This can be done by selecting 'New' from the File menu and choosing 'Assembly' as the file type.

3. Go to the 'Manage' Tab: In the top menu, navigate to the 'Manage' tab and click on the 'Insert' option. This will open a drop-down menu with the 'Import CAD' option.

4. Select 'Import CAD': Click on the 'Import CAD' option to initiate the import process. A dialog box will appear, prompting you to select the file you want to import.

5. Choose the OBJ File: Browse through your computer's directories and select the OBJ file you want to open in Inventor. Once you've chosen the file, click 'Open' to proceed.

6. Configure Import Settings: After selecting the OBJ file, a new dialog box will appear, allowing you to configure import settings such as units, scale, and positioning. Make sure to adjust these settings according to your requirements.

7. Complete the Import: Once you've configured the import settings, click 'OK' to complete the import process. Autodesk Inventor will now import the OBJ file into your assembly, making it accessible for further editing and integration.

By following these steps, you can successfully open an OBJ file in Autodesk Inventor and leverage the 3D model for your design projects. Whether you're working on mechanical parts, industrial equipment, or architectural designs, incorporating OBJ files into Inventor can enhance your workflow and creativity.